diff --git a/swad_browser.c b/swad_browser.c
index c596cbe0..bd1cc6c4 100644
--- a/swad_browser.c
+++ b/swad_browser.c
@@ -245,76 +245,6 @@ static const Brw_FileBrowser_t Brw_FileBrowserForDB_clipboard[Brw_NUM_TYPES_FILE
    [Brw_ADMI_ASS_PRJ] = Brw_ADMI_ASS_PRJ,
   };
 
-// Browsers types for database "expanded_folders" table
-static const Brw_FileBrowser_t Brw_FileBrowserForDB_expanded_folders[Brw_NUM_TYPES_FILE_BROWSER] =
-  {
-   [Brw_UNKNOWN     ] = Brw_UNKNOWN,
-   [Brw_SHOW_DOC_CRS] = Brw_ADMI_DOC_CRS,
-   [Brw_SHOW_MRK_CRS] = Brw_ADMI_MRK_CRS,
-   [Brw_ADMI_DOC_CRS] = Brw_ADMI_DOC_CRS,
-   [Brw_ADMI_SHR_CRS] = Brw_ADMI_SHR_CRS,
-   [Brw_ADMI_SHR_GRP] = Brw_ADMI_SHR_GRP,
-   [Brw_ADMI_WRK_USR] = Brw_ADMI_WRK_USR,
-   [Brw_ADMI_WRK_CRS] = Brw_ADMI_WRK_CRS,
-   [Brw_ADMI_MRK_CRS] = Brw_ADMI_MRK_CRS,
-   [Brw_ADMI_BRF_USR] = Brw_ADMI_BRF_USR,
-   [Brw_SHOW_DOC_GRP] = Brw_ADMI_DOC_GRP,
-   [Brw_ADMI_DOC_GRP] = Brw_ADMI_DOC_GRP,
-   [Brw_SHOW_MRK_GRP] = Brw_ADMI_MRK_GRP,
-   [Brw_ADMI_MRK_GRP] = Brw_ADMI_MRK_GRP,
-   [Brw_ADMI_ASG_USR] = Brw_ADMI_ASG_USR,
-   [Brw_ADMI_ASG_CRS] = Brw_ADMI_ASG_CRS,
-   [Brw_SHOW_DOC_DEG] = Brw_ADMI_DOC_DEG,
-   [Brw_ADMI_DOC_DEG] = Brw_ADMI_DOC_DEG,
-   [Brw_SHOW_DOC_CTR] = Brw_ADMI_DOC_CTR,
-   [Brw_ADMI_DOC_CTR] = Brw_ADMI_DOC_CTR,
-   [Brw_SHOW_DOC_INS] = Brw_ADMI_DOC_INS,
-   [Brw_ADMI_DOC_INS] = Brw_ADMI_DOC_INS,
-   [Brw_ADMI_SHR_DEG] = Brw_ADMI_SHR_DEG,
-   [Brw_ADMI_SHR_CTR] = Brw_ADMI_SHR_CTR,
-   [Brw_ADMI_SHR_INS] = Brw_ADMI_SHR_INS,
-   [Brw_ADMI_TCH_CRS] = Brw_ADMI_TCH_CRS,
-   [Brw_ADMI_TCH_GRP] = Brw_ADMI_TCH_GRP,
-   [Brw_ADMI_DOC_PRJ] = Brw_ADMI_DOC_PRJ,
-   [Brw_ADMI_ASS_PRJ] = Brw_ADMI_ASS_PRJ,
-  };
-
-// Browsers types for database "brw_last" table
-// Assignments and works are stored as one in brw_last...
-// ...because a user views them at the same time
-static const Brw_FileBrowser_t Brw_FileBrowserForDB_file_browser_last[Brw_NUM_TYPES_FILE_BROWSER] =
-  {
-   [Brw_UNKNOWN     ] = Brw_UNKNOWN,
-   [Brw_SHOW_DOC_CRS] = Brw_ADMI_DOC_CRS,
-   [Brw_SHOW_MRK_CRS] = Brw_ADMI_MRK_CRS,
-   [Brw_ADMI_DOC_CRS] = Brw_ADMI_DOC_CRS,
-   [Brw_ADMI_SHR_CRS] = Brw_ADMI_SHR_CRS,
-   [Brw_ADMI_SHR_GRP] = Brw_ADMI_SHR_GRP,
-   [Brw_ADMI_WRK_USR] = Brw_ADMI_ASG_USR,
-   [Brw_ADMI_WRK_CRS] = Brw_ADMI_ASG_CRS,
-   [Brw_ADMI_MRK_CRS] = Brw_ADMI_MRK_CRS,
-   [Brw_ADMI_BRF_USR] = Brw_ADMI_BRF_USR,
-   [Brw_SHOW_DOC_GRP] = Brw_ADMI_DOC_GRP,
-   [Brw_ADMI_DOC_GRP] = Brw_ADMI_DOC_GRP,
-   [Brw_SHOW_MRK_GRP] = Brw_ADMI_MRK_GRP,
-   [Brw_ADMI_MRK_GRP] = Brw_ADMI_MRK_GRP,
-   [Brw_ADMI_ASG_USR] = Brw_ADMI_ASG_USR,
-   [Brw_ADMI_ASG_CRS] = Brw_ADMI_ASG_CRS,
-   [Brw_SHOW_DOC_DEG] = Brw_ADMI_DOC_DEG,
-   [Brw_ADMI_DOC_DEG] = Brw_ADMI_DOC_DEG,
-   [Brw_SHOW_DOC_CTR] = Brw_ADMI_DOC_CTR,
-   [Brw_ADMI_DOC_CTR] = Brw_ADMI_DOC_CTR,
-   [Brw_SHOW_DOC_INS] = Brw_ADMI_DOC_INS,
-   [Brw_ADMI_DOC_INS] = Brw_ADMI_DOC_INS,
-   [Brw_ADMI_SHR_DEG] = Brw_ADMI_SHR_DEG,
-   [Brw_ADMI_SHR_CTR] = Brw_ADMI_SHR_CTR,
-   [Brw_ADMI_SHR_INS] = Brw_ADMI_SHR_INS,
-   [Brw_ADMI_TCH_CRS] = Brw_ADMI_TCH_CRS,
-   [Brw_ADMI_TCH_GRP] = Brw_ADMI_TCH_GRP,
-   [Brw_ADMI_DOC_PRJ] = Brw_ADMI_DOC_PRJ,
-   [Brw_ADMI_ASS_PRJ] = Brw_ADMI_ASS_PRJ,
-  };
-
 static const bool Brw_FileBrowserIsEditable[Brw_NUM_TYPES_FILE_BROWSER] =
   {
    [Brw_UNKNOWN     ] = false,
@@ -1373,18 +1303,7 @@ static bool Brw_CheckIfClipboardIsInThisTree (void);
 
 static void Brw_InsFoldersInPathAndUpdOtherFoldersInExpandedFolders (const char Path[PATH_MAX + 1]);
 static void Brw_RemThisFolderAndUpdOtherFoldersFromExpandedFolders (const char Path[PATH_MAX + 1]);
-static void Brw_DB_InsertFolderInExpandedFolders (const char Path[PATH_MAX + 1]);
-static void Brw_DB_UpdateClickTimeOfThisFileBrowserInExpandedFolders (void);
-static void Brw_DB_RemoveFolderFromExpandedFolders (const char Path[PATH_MAX + 1]);
-static void Brw_DB_RemoveAffectedExpandedFolders (const char Path[PATH_MAX + 1]);
-static void Brw_DB_RenameAffectedExpandedFolders (Brw_FileBrowser_t FileBrowser,
-                                                  long MyUsrCod,long WorksUsrCod,
-                                                  const char *OldPath,const char *NewPath);
-static bool Brw_DB_GetIfExpandedTree (const char Path[PATH_MAX + 1]);
 
-static void Brw_DB_RemoveExpiredClipboards (void);
-static void Brw_DB_RemoveAffectedClipboards (Brw_FileBrowser_t FileBrowser,
-                                             long MyUsrCod,long WorksUsrCod);
 static void Brw_PasteClipboard (void);
 static unsigned Brw_NumLevelsInPath (const char Path[PATH_MAX + 1]);
 static bool Brw_PasteTreeIntoFolder (unsigned Level,
@@ -4272,8 +4191,7 @@ static void Brw_GetAndUpdateDateLastAccFileBrowser (void)
    unsigned NumRows;
 
    /***** Get date of last accesss to a file browser from database *****/
-   NumRows = Brw_DB_GetDateMyLastAccFileBrowser (&mysql_res,
-                                                 Brw_FileBrowserForDB_file_browser_last[Gbl.FileBrowser.Type]);
+   NumRows = Brw_DB_GetDateMyLastAccFileBrowser (&mysql_res);
 
    if (NumRows == 0)	// May be an administrator not belonging to this course
       Gbl.Usrs.Me.TimeLastAccToThisFileBrowser = LONG_MAX;	// Initialize to a big value in order to show files as old
@@ -4293,7 +4211,7 @@ static void Brw_GetAndUpdateDateLastAccFileBrowser (void)
    DB_FreeMySQLResult (&mysql_res);
 
    /***** Update date of my last access to file browser in this course *****/
-   Brw_DB_UpdateDateMyLastAccFileBrowser (Brw_FileBrowserForDB_file_browser_last[Gbl.FileBrowser.Type]);
+   Brw_DB_UpdateDateMyLastAccFileBrowser ();
   }
 
 /*****************************************************************************/
@@ -4481,7 +4399,7 @@ static void Brw_ListDir (unsigned Level,const char *ParentRowId,
 			IconSubtree = Brw_ICON_TREE_NOTHING;
 		     else
 			/***** Check if the tree starting at this subdirectory must be expanded *****/
-			IconSubtree = Brw_DB_GetIfExpandedTree (Gbl.FileBrowser.FilFolLnk.Full) ? Brw_ICON_TREE_CONTRACT :
+			IconSubtree = Brw_DB_GetIfExpandedFolder (Gbl.FileBrowser.FilFolLnk.Full) ? Brw_ICON_TREE_CONTRACT :
 												    Brw_ICON_TREE_EXPAND;
 		     for (NumFileInSubdir = 0;
 			  NumFileInSubdir < NumFilesInSubdir;
@@ -6346,7 +6264,7 @@ static void Brw_InsFoldersInPathAndUpdOtherFoldersInExpandedFolders (const char
      {
       if ((Ptr = strrchr (CopyOfPath,'/')))	// If '/' found (backwards from the end)
 	{
-	 if (!Brw_DB_GetIfExpandedTree (CopyOfPath))
+	 if (!Brw_DB_GetIfExpandedFolder (CopyOfPath))
 	    Brw_DB_InsertFolderInExpandedFolders (CopyOfPath);
 	 // Now Ptr points to the last '/' in SubPath
 	 *Ptr = '\0';	// Substitute '/' for '\0' to shorten CopyOfPath
@@ -6372,425 +6290,6 @@ static void Brw_RemThisFolderAndUpdOtherFoldersFromExpandedFolders (const char P
    Brw_DB_UpdateClickTimeOfThisFileBrowserInExpandedFolders ();
   }
 
-/*****************************************************************************/
-/************************* Insert path in expanded folders *******************/
-/*****************************************************************************/
-
-static void Brw_DB_InsertFolderInExpandedFolders (const char Path[PATH_MAX + 1])
-  {
-   long Cod = Brw_GetCodForFileBrowser ();
-   long WorksUsrCod = Brw_GetZoneUsrCodForFileBrowser ();
-
-   /***** Update path time in table of expanded folders *****/
-   // Path must be stored with final '/'
-   DB_QueryINSERT ("can not expand the content of a folder",
-		   "INSERT INTO brw_expanded"
-		   " (UsrCod,FileBrowser,Cod,WorksUsrCod,Path,ClickTime)"
-		   " VALUES"
-		   " (%ld,%u,%ld,%ld,'%s/',NOW())",
-	           Gbl.Usrs.Me.UsrDat.UsrCod,
-	           (unsigned) Brw_FileBrowserForDB_expanded_folders[Gbl.FileBrowser.Type],
-	           Cod,WorksUsrCod,
-	           Path);
-  }
-
-/*****************************************************************************/
-/******* Update paths of the current file browser in expanded folders ********/
-/*****************************************************************************/
-
-static void Brw_DB_UpdateClickTimeOfThisFileBrowserInExpandedFolders (void)
-  {
-   long Cod = Brw_GetCodForFileBrowser ();
-   long WorksUsrCod = Brw_GetZoneUsrCodForFileBrowser ();
-   Brw_FileBrowser_t FileBrowserForExpandedFolders = Brw_FileBrowserForDB_expanded_folders[Gbl.FileBrowser.Type];
-
-   /***** Update click time in table of expanded folders *****/
-   if (Cod > 0)
-     {
-      if (WorksUsrCod > 0)
-	 DB_QueryUPDATE ("can not update expanded folder",
-			 "UPDATE brw_expanded"
-			   " SET ClickTime=NOW()"
-			 " WHERE UsrCod=%ld"
-			   " AND FileBrowser=%u"
-			   " AND Cod=%ld"
-			   " AND WorksUsrCod=%ld",
-		         Gbl.Usrs.Me.UsrDat.UsrCod,
-		         (unsigned) FileBrowserForExpandedFolders,
-		         Cod,
-		         WorksUsrCod);
-      else
-	 DB_QueryUPDATE ("can not update expanded folder",
-			 "UPDATE brw_expanded"
-			   " SET ClickTime=NOW()"
-			 " WHERE UsrCod=%ld"
-			   " AND FileBrowser=%u"
-			   " AND Cod=%ld",
-		         Gbl.Usrs.Me.UsrDat.UsrCod,
-		         (unsigned) FileBrowserForExpandedFolders,
-		         Cod);
-     }
-   else	// Briefcase
-      DB_QueryUPDATE ("can not update expanded folder",
-		      "UPDATE brw_expanded"
-		        " SET ClickTime=NOW()"
-		      " WHERE UsrCod=%ld"
-		        " AND FileBrowser=%u",
-	              Gbl.Usrs.Me.UsrDat.UsrCod,
-	              (unsigned) FileBrowserForExpandedFolders);
-  }
-
-/*****************************************************************************/
-/********************** Remove path from expanded folders ********************/
-/*****************************************************************************/
-
-static void Brw_DB_RemoveFolderFromExpandedFolders (const char Path[PATH_MAX + 1])
-  {
-   long Cod = Brw_GetCodForFileBrowser ();
-   long WorksUsrCod = Brw_GetZoneUsrCodForFileBrowser ();
-   Brw_FileBrowser_t FileBrowserForExpandedFolders = Brw_FileBrowserForDB_expanded_folders[Gbl.FileBrowser.Type];
-
-   /***** Remove expanded folders associated to a file browser *****/
-   if (Cod > 0)
-     {
-      if (WorksUsrCod > 0)
-         DB_QueryDELETE ("can not contract the content of a folder",
-			 "DELETE FROM brw_expanded"
-			 " WHERE UsrCod=%ld"
-			   " AND FileBrowser=%u"
-			   " AND Cod=%ld"
-			   " AND WorksUsrCod=%ld"
-			   " AND Path='%s/'",
-		         Gbl.Usrs.Me.UsrDat.UsrCod,(unsigned) FileBrowserForExpandedFolders,
-		         Cod,WorksUsrCod,Path);
-      else
-	 DB_QueryDELETE ("can not contract the content of a folder",
-		         "DELETE FROM brw_expanded"
-			 " WHERE UsrCod=%ld"
-			   " AND FileBrowser=%u"
-			   " AND Cod=%ld"
-			   " AND Path='%s/'",
-		         Gbl.Usrs.Me.UsrDat.UsrCod,
-		         (unsigned) FileBrowserForExpandedFolders,
-		         Cod,Path);
-     }
-   else	// Briefcase
-      DB_QueryDELETE ("can not contract the content of a folder",
-		      "DELETE FROM brw_expanded"
-		      " WHERE UsrCod=%ld"
-		        " AND FileBrowser=%u"
-		        " AND Path='%s/'",
-	              Gbl.Usrs.Me.UsrDat.UsrCod,(unsigned) FileBrowserForExpandedFolders,
-	              Path);
-  }
-
-/*****************************************************************************/
-/***** Remove expanded folders with paths from a course or from a user *******/
-/*****************************************************************************/
-
-static void Brw_DB_RemoveAffectedExpandedFolders (const char Path[PATH_MAX + 1])
-  {
-   long Cod = Brw_GetCodForFileBrowser ();
-   long WorksUsrCod = Brw_GetZoneUsrCodForFileBrowser ();
-   Brw_FileBrowser_t FileBrowserForExpandedFolders = Brw_FileBrowserForDB_expanded_folders[Gbl.FileBrowser.Type];
-
-   /***** Remove expanded folders associated to a file browser from a course or from a user *****/
-   if (Cod > 0)
-     {
-      if (WorksUsrCod > 0)
-         DB_QueryDELETE ("can not remove expanded folders",
-			 "DELETE FROM brw_expanded"
-			 " WHERE UsrCod=%ld"
-			   " AND FileBrowser=%u"
-			   " AND Cod=%ld"
-			   " AND WorksUsrCod=%ld"
-			   " AND Path LIKE '%s/%%'",
-		         Gbl.Usrs.Me.UsrDat.UsrCod,(unsigned) FileBrowserForExpandedFolders,
-		         Cod,WorksUsrCod,Path);
-      else
-         DB_QueryDELETE ("can not remove expanded folders",
-			 "DELETE FROM brw_expanded"
-			 " WHERE UsrCod=%ld"
-			   " AND FileBrowser=%u"
-			   " AND Cod=%ld"
-			   " AND Path LIKE '%s/%%'",
-		         Gbl.Usrs.Me.UsrDat.UsrCod,
-		         (unsigned) FileBrowserForExpandedFolders,
-		         Cod,Path);
-     }
-   else	// Briefcase
-      DB_QueryDELETE ("can not remove expanded folders",
-		      "DELETE FROM brw_expanded"
-		      " WHERE UsrCod=%ld"
-		        " AND FileBrowser=%u"
-		        " AND Path LIKE '%s/%%'",
-		      Gbl.Usrs.Me.UsrDat.UsrCod,
-		      (unsigned) FileBrowserForExpandedFolders,
-		      Path);
-  }
-
-/*****************************************************************************/
-/***** Remove expanded folders with paths from a course or from a user *******/
-/*****************************************************************************/
-
-static void Brw_DB_RenameAffectedExpandedFolders (Brw_FileBrowser_t FileBrowser,
-                                                  long MyUsrCod,long WorksUsrCod,
-                                                  const char *OldPath,const char *NewPath)
-  {
-   long Cod = Brw_GetCodForFileBrowser ();
-   Brw_FileBrowser_t FileBrowserForExpandedFolders = Brw_FileBrowserForDB_expanded_folders[FileBrowser];
-   unsigned StartFinalSubpathNotChanged = strlen (OldPath) + 2;
-
-   /***** Update expanded folders associated to a file browser from a course or from a user *****/
-   if (Cod > 0)
-     {
-      if (MyUsrCod > 0)
-	{
-	 if (WorksUsrCod > 0)
-	    DB_QueryUPDATE ("can not update expanded folders",
-			    "UPDATE brw_expanded"
-			      " SET Path=CONCAT('%s','/',SUBSTRING(Path,%u))"
-			    " WHERE UsrCod=%ld"
-			      " AND FileBrowser=%u"
-			      " AND Cod=%ld"
-			      " AND WorksUsrCod=%ld"
-			      " AND Path LIKE '%s/%%'",
-		            NewPath,StartFinalSubpathNotChanged,
-		            MyUsrCod,(unsigned) FileBrowserForExpandedFolders,
-		            Cod,WorksUsrCod,
-		            OldPath);
-	 else
-	    DB_QueryUPDATE ("can not update expanded folders",
-			    "UPDATE brw_expanded"
-			      " SET Path=CONCAT('%s','/',SUBSTRING(Path,%u))"
-			    " WHERE UsrCod=%ld"
-			      " AND FileBrowser=%u"
-			      " AND Cod=%ld"
-			      " AND Path LIKE '%s/%%'",
-		            NewPath,StartFinalSubpathNotChanged,
-		            MyUsrCod,(unsigned) FileBrowserForExpandedFolders,
-		            Cod,
-		            OldPath);
-	}
-      else	// MyUsrCod <= 0 means expanded folders for any user
-	{
-	 if (WorksUsrCod > 0)
-	    DB_QueryUPDATE ("can not update expanded folders",
-			    "UPDATE brw_expanded"
-			      " SET Path=CONCAT('%s','/',SUBSTRING(Path,%u))"
-			    " WHERE FileBrowser=%u"
-			      " AND Cod=%ld"
-			      " AND WorksUsrCod=%ld"
-			      " AND Path LIKE '%s/%%'",
-		            NewPath,StartFinalSubpathNotChanged,
-		            (unsigned) FileBrowserForExpandedFolders,Cod,
-		            WorksUsrCod,
-		            OldPath);
-	 else
-	    DB_QueryUPDATE ("can not update expanded folders",
-			    "UPDATE brw_expanded"
-			      " SET Path=CONCAT('%s','/',SUBSTRING(Path,%u))"
-			    " WHERE FileBrowser=%u"
-			      " AND Cod=%ld"
-			      " AND Path LIKE '%s/%%'",
-			    NewPath,StartFinalSubpathNotChanged,
-			    (unsigned) FileBrowserForExpandedFolders,Cod,
-			    OldPath);
-	}
-     }
-   else	// Briefcase
-      DB_QueryUPDATE ("can not update expanded folders",
-		      "UPDATE brw_expanded"
-		        " SET Path=CONCAT('%s','/',SUBSTRING(Path,%u))"
-		      " WHERE UsrCod=%ld"
-		        " AND FileBrowser=%u"
-		        " AND Path LIKE '%s/%%'",
-	              NewPath,StartFinalSubpathNotChanged,
-	              MyUsrCod,
-	              (unsigned) FileBrowserForExpandedFolders,
-	              OldPath);
-  }
-
-/*****************************************************************************/
-/************* Check if a folder from a file browser is expanded *************/
-/*****************************************************************************/
-
-static bool Brw_DB_GetIfExpandedTree (const char Path[PATH_MAX + 1])
-  {
-   bool Expanded;
-   long Cod = Brw_GetCodForFileBrowser ();
-   long WorksUsrCod = Brw_GetZoneUsrCodForFileBrowser ();
-   Brw_FileBrowser_t FileBrowserForExpandedFolders = Brw_FileBrowserForDB_expanded_folders[Gbl.FileBrowser.Type];
-
-   /***** Get if a folder is expanded from database *****/
-   if (Cod > 0)
-     {
-      if (WorksUsrCod > 0)
-         Expanded = (DB_QueryCOUNT ("can not get check if a folder is expanded",
-				    "SELECT COUNT(*)"
-				     " FROM brw_expanded"
-				    " WHERE UsrCod=%ld"
-				      " AND FileBrowser=%u"
-				      " AND Cod=%ld"
-				      " AND WorksUsrCod=%ld"
-				      " AND Path='%s/'",
-				    Gbl.Usrs.Me.UsrDat.UsrCod,
-				    (unsigned) FileBrowserForExpandedFolders,
-				    Cod,WorksUsrCod,
-				    Path) != 0);
-      else
-         Expanded = (DB_QueryCOUNT ("can not get check if a folder is expanded",
-				    "SELECT COUNT(*)"
-				     " FROM brw_expanded"
-				    " WHERE UsrCod=%ld"
-				      " AND FileBrowser=%u"
-				      " AND Cod=%ld"
-				      " AND Path='%s/'",
-				    Gbl.Usrs.Me.UsrDat.UsrCod,
-				    (unsigned) FileBrowserForExpandedFolders,
-				    Cod,
-				    Path) != 0);
-     }
-   else	// Briefcase
-      Expanded = (DB_QueryCOUNT ("can not get check if a folder is expanded",
-				 "SELECT COUNT(*)"
-				  " FROM brw_expanded"
-				 " WHERE UsrCod=%ld"
-				   " AND FileBrowser=%u"
-				   " AND Path='%s/'",
-				 Gbl.Usrs.Me.UsrDat.UsrCod,
-				 (unsigned) FileBrowserForExpandedFolders,
-				 Path) != 0);
-   return Expanded;
-  }
-
-/*****************************************************************************/
-/************* Remove expired expanded folders (from all users) **************/
-/*****************************************************************************/
-
-void Brw_DB_RemoveExpiredExpandedFolders (void)
-  {
-   /***** Remove all expired clipboards *****/
-   DB_QueryDELETE ("can not remove old expanded folders",
-		   "DELETE LOW_PRIORITY FROM brw_expanded"
-		   " WHERE ClickTime<FROM_UNIXTIME(UNIX_TIMESTAMP()-%lu)",
-                   Cfg_TIME_TO_DELETE_BROWSER_EXPANDED_FOLDERS);
-  }
-
-/*****************************************************************************/
-/****************** Remove expired clipboards (from all users) ***************/
-/*****************************************************************************/
-
-static void Brw_DB_RemoveExpiredClipboards (void)
-  {
-   /***** Remove all expired clipboards *****/
-   DB_QueryDELETE ("can not remove old paths from clipboard",
-		   "DELETE LOW_PRIORITY FROM brw_clipboards"
-		   " WHERE CopyTime<FROM_UNIXTIME(UNIX_TIMESTAMP()-%lu)",
-                   Cfg_TIME_TO_DELETE_BROWSER_CLIPBOARD);
-  }
-
-/*****************************************************************************/
-/********* Remove clipboards with paths from a course or from a user *********/
-/*****************************************************************************/
-
-static void Brw_DB_RemoveAffectedClipboards (Brw_FileBrowser_t FileBrowser,
-                                             long MyUsrCod,long WorksUsrCod)
-  {
-   /***** Remove clipboards associated to a file browser
-          from a course or from a user *****/
-   switch (FileBrowser)
-     {
-      case Brw_ADMI_DOC_INS:
-      case Brw_ADMI_SHR_INS:
-         DB_QueryDELETE ("can not remove source of copy",
-			 "DELETE FROM brw_clipboards"
-			 " WHERE FileBrowser=%u"
-			   " AND Cod=%ld",
-			 (unsigned) FileBrowser,
-			 Gbl.Hierarchy.Ins.InsCod);
-         break;
-      case Brw_ADMI_DOC_CTR:
-      case Brw_ADMI_SHR_CTR:
-         DB_QueryDELETE ("can not remove source of copy",
-			 "DELETE FROM brw_clipboards"
-			 " WHERE FileBrowser=%u"
-			   " AND Cod=%ld",
-                         (unsigned) FileBrowser,
-                         Gbl.Hierarchy.Ctr.CtrCod);
-         break;
-      case Brw_ADMI_DOC_DEG:
-      case Brw_ADMI_SHR_DEG:
-         DB_QueryDELETE ("can not remove source of copy",
-			 "DELETE FROM brw_clipboards"
-			 " WHERE FileBrowser=%u"
-			   " AND Cod=%ld",
-                         (unsigned) FileBrowser,
-                         Gbl.Hierarchy.Deg.DegCod);
-         break;
-      case Brw_ADMI_DOC_CRS:
-      case Brw_ADMI_TCH_CRS:
-      case Brw_ADMI_SHR_CRS:
-      case Brw_ADMI_MRK_CRS:
-         DB_QueryDELETE ("can not remove source of copy",
-			 "DELETE FROM brw_clipboards"
-			 " WHERE FileBrowser=%u"
-			   " AND Cod=%ld",
-                         (unsigned) FileBrowser,
-                         Gbl.Hierarchy.Crs.CrsCod);
-         break;
-      case Brw_ADMI_DOC_GRP:
-      case Brw_ADMI_TCH_GRP:
-      case Brw_ADMI_SHR_GRP:
-      case Brw_ADMI_MRK_GRP:
-         DB_QueryDELETE ("can not remove source of copy",
-			 "DELETE FROM brw_clipboards"
-			 " WHERE FileBrowser=%u"
-			   " AND Cod=%ld",
-                         (unsigned) FileBrowser,
-                         Gbl.Crs.Grps.GrpCod);
-         break;
-      case Brw_ADMI_ASG_USR:
-      case Brw_ADMI_WRK_USR:
-         DB_QueryDELETE ("can not remove source of copy",
-			 "DELETE FROM brw_clipboards"
-			 " WHERE UsrCod=%ld"
-			   " AND FileBrowser=%u"
-			   " AND Cod=%ld",
-                         MyUsrCod,(unsigned) FileBrowser,
-                         Gbl.Hierarchy.Crs.CrsCod);
-         break;
-      case Brw_ADMI_ASG_CRS:
-      case Brw_ADMI_WRK_CRS:
-         DB_QueryDELETE ("can not remove source of copy",
-			 "DELETE FROM brw_clipboards"
-			 " WHERE FileBrowser=%u"
-			   " AND Cod=%ld"
-			   " AND WorksUsrCod=%ld",
-                         (unsigned) FileBrowser,
-                         Gbl.Hierarchy.Crs.CrsCod,WorksUsrCod);
-         break;
-      case Brw_ADMI_DOC_PRJ:
-      case Brw_ADMI_ASS_PRJ:
-         DB_QueryDELETE ("can not remove source of copy",
-			 "DELETE FROM brw_clipboards"
-			 " WHERE FileBrowser=%u"
-			   " AND Cod=%ld",
-                         (unsigned) FileBrowser,
-                         Prj_GetPrjCod ());
-	 break;
-      case Brw_ADMI_BRF_USR:
-         DB_QueryDELETE ("can not remove source of copy",
-			 "DELETE FROM brw_clipboards"
-			 " WHERE UsrCod=%ld"
-			   " AND FileBrowser=%u",
-                         MyUsrCod,(unsigned) FileBrowser);
-         break;
-      default:
-         break;
-     }
-  }
-
 /*****************************************************************************/
 /**** Paste the arch/carp indicado in the portapapelesde in file browser *****/
 /*****************************************************************************/
@@ -7028,7 +6527,7 @@ static void Brw_PasteClipboard (void)
             Brw_GetFileMetadataByCod (&FileMetadata);
 
 	    /* Notify only is destination folder is visible */
-	    if (!Brw_DB_CheckIfFileOrFolderIsHidden (&FileMetadata))
+	    if (!Brw_DB_CheckIfFileOrFolderIsSetAsHiddenUsingMetadata (&FileMetadata))
 	       switch (Gbl.FileBrowser.Type)
 		 {
 		  case Brw_ADMI_DOC_CRS:
@@ -7998,7 +7497,7 @@ static bool Brw_RcvFileInFileBrw (Brw_UploadType_t UploadType)
                               Mrk_DB_AddMarks (FileMetadata.FilCod,&Marks);
 
                            /* Notify new file */
-			   if (!Brw_DB_CheckIfFileOrFolderIsHidden (&FileMetadata))
+			   if (!Brw_DB_CheckIfFileOrFolderIsSetAsHiddenUsingMetadata (&FileMetadata))
 			      switch (Gbl.FileBrowser.Type)
 				{
 				 case Brw_ADMI_DOC_CRS:
@@ -8170,7 +7669,7 @@ void Brw_RecLinkFileBrowser (void)
 		     Brw_GetFileMetadataByCod (&FileMetadata);
 
 		     /* Notify new file */
-		     if (!Brw_DB_CheckIfFileOrFolderIsHidden (&FileMetadata))
+		     if (!Brw_DB_CheckIfFileOrFolderIsSetAsHiddenUsingMetadata (&FileMetadata))
 			switch (Gbl.FileBrowser.Type)
 			  {
 			   case Brw_ADMI_DOC_CRS:
@@ -8325,23 +7824,12 @@ void Brw_SetDocumentAsHidden (void)
 
 bool Brw_CheckIfFileOrFolderIsSetAsHiddenInDB (Brw_FileType_t FileType,const char *Path)
   {
-   long Cod = Brw_GetCodForFileBrowser ();
-   long ZoneUsrCod = Brw_GetZoneUsrCodForFileBrowser ();
    MYSQL_RES *mysql_res;
    MYSQL_ROW row;
    bool IsHidden = false;
 
    /***** Get if a file or folder is hidden from database *****/
-   if (DB_QuerySELECT (&mysql_res,"can not check if a file is hidden",
-		       "SELECT Hidden"		// row[0]
-		        " FROM brw_files"
-		       " WHERE FileBrowser=%u"
-		         " AND Cod=%ld"
-		         " AND ZoneUsrCod=%ld"
-		         " AND Path='%s'",
-		       (unsigned) Brw_FileBrowserForDB_files[Gbl.FileBrowser.Type],
-		       Cod,ZoneUsrCod,
-		       Path))
+   if (Brw_DB_CheckIfFileOrFolderIsSetAsHiddenUsingPath (&mysql_res,Path))
      {
       /* Get row */
       row = mysql_fetch_row (mysql_res);
@@ -8359,36 +7847,6 @@ bool Brw_CheckIfFileOrFolderIsSetAsHiddenInDB (Brw_FileType_t FileType,const cha
    return IsHidden;
   }
 
-/*****************************************************************************/
-/******** Check if a file / folder from the documents zone is hidden *********/
-/*****************************************************************************/
-
-bool Brw_DB_CheckIfFileOrFolderIsHidden (struct FileMetadata *FileMetadata)
-  {
-   /***** Get if a file or folder is under a hidden folder from database *****/
-   /*
-      The argument Path passed to this function is hidden if:
-      1) the argument Path is exactly the same as a path stored in database
-         or
-      2) the argument Path begins by 'x/', where x is a path stored in database
-   */
-   return (DB_QueryCOUNT ("can not check if a file or folder is hidden",
-			  "SELECT COUNT(*)"
-			   " FROM brw_files"
-			  " WHERE FileBrowser=%u"
-			    " AND Cod=%ld"
-			    " AND ZoneUsrCod=%ld"
-			    " AND Hidden='Y'"
-			    " AND (Path='%s'"
-			         " OR"
-			         " LOCATE(CONCAT(Path,'/'),'%s')=1)",
-			  FileMetadata->FileBrowser,
-			  FileMetadata->Cod,
-			  FileMetadata->ZoneUsrCod,
-			  FileMetadata->FilFolLnk.Full,
-			  FileMetadata->FilFolLnk.Full) != 0);
-  }
-
 /*****************************************************************************/
 /***************** Show metadata of a file in a file browser *****************/
 /*****************************************************************************/
@@ -8450,20 +7908,20 @@ void Brw_ShowFileMetadata (void)
 	{
 	 case Brw_SHOW_DOC_INS:
 	    if (Gbl.Usrs.Me.Role.Logged < Rol_INS_ADM)
-	       ICanView = !Brw_DB_CheckIfFileOrFolderIsHidden (&FileMetadata);
+	       ICanView = !Brw_DB_CheckIfFileOrFolderIsSetAsHiddenUsingMetadata (&FileMetadata);
             break;
 	 case Brw_SHOW_DOC_CTR:
 	    if (Gbl.Usrs.Me.Role.Logged < Rol_CTR_ADM)
-	       ICanView = !Brw_DB_CheckIfFileOrFolderIsHidden (&FileMetadata);
+	       ICanView = !Brw_DB_CheckIfFileOrFolderIsSetAsHiddenUsingMetadata (&FileMetadata);
             break;
 	 case Brw_SHOW_DOC_DEG:
 	    if (Gbl.Usrs.Me.Role.Logged < Rol_DEG_ADM)
-	       ICanView = !Brw_DB_CheckIfFileOrFolderIsHidden (&FileMetadata);
+	       ICanView = !Brw_DB_CheckIfFileOrFolderIsSetAsHiddenUsingMetadata (&FileMetadata);
             break;
 	 case Brw_SHOW_DOC_CRS:
 	 case Brw_SHOW_DOC_GRP:
 	    if (Gbl.Usrs.Me.Role.Logged < Rol_TCH)
-               ICanView = !Brw_DB_CheckIfFileOrFolderIsHidden (&FileMetadata);
+               ICanView = !Brw_DB_CheckIfFileOrFolderIsSetAsHiddenUsingMetadata (&FileMetadata);
 	    break;
 	 default:
 	    break;
@@ -8850,20 +8308,20 @@ void Brw_DownloadFile (void)
 	{
 	 case Brw_SHOW_DOC_INS:
 	    if (Gbl.Usrs.Me.Role.Logged < Rol_INS_ADM)
-	       ICanView = !Brw_DB_CheckIfFileOrFolderIsHidden (&FileMetadata);
+	       ICanView = !Brw_DB_CheckIfFileOrFolderIsSetAsHiddenUsingMetadata (&FileMetadata);
             break;
 	 case Brw_SHOW_DOC_CTR:
 	    if (Gbl.Usrs.Me.Role.Logged < Rol_CTR_ADM)
-	       ICanView = !Brw_DB_CheckIfFileOrFolderIsHidden (&FileMetadata);
+	       ICanView = !Brw_DB_CheckIfFileOrFolderIsSetAsHiddenUsingMetadata (&FileMetadata);
             break;
 	 case Brw_SHOW_DOC_DEG:
 	    if (Gbl.Usrs.Me.Role.Logged < Rol_DEG_ADM)
-	       ICanView = !Brw_DB_CheckIfFileOrFolderIsHidden (&FileMetadata);
+	       ICanView = !Brw_DB_CheckIfFileOrFolderIsSetAsHiddenUsingMetadata (&FileMetadata);
             break;
 	 case Brw_SHOW_DOC_CRS:
 	 case Brw_SHOW_DOC_GRP:
 	    if (Gbl.Usrs.Me.Role.Logged < Rol_TCH)
-               ICanView = !Brw_DB_CheckIfFileOrFolderIsHidden (&FileMetadata);
+               ICanView = !Brw_DB_CheckIfFileOrFolderIsSetAsHiddenUsingMetadata (&FileMetadata);
 	    break;
 	 default:
 	    break;
@@ -10902,7 +10360,7 @@ static void Brw_WriteRowDocData (unsigned *NumDocsNotHidden,MYSQL_ROW row)
    FileMetadata.FilCod = Str_ConvertStrCodToLongCod (row[0]);
    Brw_GetFileMetadataByCod (&FileMetadata);
 
-   if (!Brw_DB_CheckIfFileOrFolderIsHidden (&FileMetadata))
+   if (!Brw_DB_CheckIfFileOrFolderIsSetAsHiddenUsingMetadata (&FileMetadata))
      {
       /***** Get institution code (row[2]) *****/
       InsCod = Str_ConvertStrCodToLongCod (row[2]);
diff --git a/swad_browser.h b/swad_browser.h
index a9b9c0e6..5a216750 100644
--- a/swad_browser.h
+++ b/swad_browser.h
@@ -207,7 +207,6 @@ void Brw_RecLinkFileBrowser (void);
 void Brw_SetDocumentAsVisible (void);
 void Brw_SetDocumentAsHidden (void);
 bool Brw_CheckIfFileOrFolderIsSetAsHiddenInDB (Brw_FileType_t FileType,const char *Path);
-bool Brw_DB_CheckIfFileOrFolderIsHidden (struct FileMetadata *FileMetadata);
 void Brw_ShowFileMetadata (void);
 void Brw_DownloadFile (void);
 void Brw_GetLinkToDownloadFile (const char *PathInTree,const char *FileName,char *URL);
diff --git a/swad_browser_database.c b/swad_browser_database.c
index cc992180..18e262e2 100644
--- a/swad_browser_database.c
+++ b/swad_browser_database.c
@@ -33,7 +33,7 @@
 // #include <stddef.h>		// For NULL
 // #include <stdio.h>		// For asprintf
 // #include <stdlib.h>		// For exit, system, free, etc
-// #include <string.h>		// For string functions
+#include <string.h>		// For string functions
 // #include <sys/types.h>		// For lstat, time_t
 // #include <sys/stat.h>		// For lstat
 // #include <time.h>		// For time
@@ -61,7 +61,7 @@
 // #include "swad_parameter.h"
 // #include "swad_photo.h"
 // #include "swad_profile.h"
-// #include "swad_project.h"
+#include "swad_project.h"
 // #include "swad_role.h"
 // #include "swad_setting.h"
 // #include "swad_string.h"
@@ -87,6 +87,76 @@ extern struct Globals Gbl;
 /***************************** Private constants *****************************/
 /*****************************************************************************/
 
+// Browsers types for database "brw_last" table
+// Assignments and works are stored as one in brw_last...
+// ...because a user views them at the same time
+static const Brw_FileBrowser_t Brw_FileBrowserForDB_file_browser_last[Brw_NUM_TYPES_FILE_BROWSER] =
+  {
+   [Brw_UNKNOWN     ] = Brw_UNKNOWN,
+   [Brw_SHOW_DOC_CRS] = Brw_ADMI_DOC_CRS,
+   [Brw_SHOW_MRK_CRS] = Brw_ADMI_MRK_CRS,
+   [Brw_ADMI_DOC_CRS] = Brw_ADMI_DOC_CRS,
+   [Brw_ADMI_SHR_CRS] = Brw_ADMI_SHR_CRS,
+   [Brw_ADMI_SHR_GRP] = Brw_ADMI_SHR_GRP,
+   [Brw_ADMI_WRK_USR] = Brw_ADMI_ASG_USR,
+   [Brw_ADMI_WRK_CRS] = Brw_ADMI_ASG_CRS,
+   [Brw_ADMI_MRK_CRS] = Brw_ADMI_MRK_CRS,
+   [Brw_ADMI_BRF_USR] = Brw_ADMI_BRF_USR,
+   [Brw_SHOW_DOC_GRP] = Brw_ADMI_DOC_GRP,
+   [Brw_ADMI_DOC_GRP] = Brw_ADMI_DOC_GRP,
+   [Brw_SHOW_MRK_GRP] = Brw_ADMI_MRK_GRP,
+   [Brw_ADMI_MRK_GRP] = Brw_ADMI_MRK_GRP,
+   [Brw_ADMI_ASG_USR] = Brw_ADMI_ASG_USR,
+   [Brw_ADMI_ASG_CRS] = Brw_ADMI_ASG_CRS,
+   [Brw_SHOW_DOC_DEG] = Brw_ADMI_DOC_DEG,
+   [Brw_ADMI_DOC_DEG] = Brw_ADMI_DOC_DEG,
+   [Brw_SHOW_DOC_CTR] = Brw_ADMI_DOC_CTR,
+   [Brw_ADMI_DOC_CTR] = Brw_ADMI_DOC_CTR,
+   [Brw_SHOW_DOC_INS] = Brw_ADMI_DOC_INS,
+   [Brw_ADMI_DOC_INS] = Brw_ADMI_DOC_INS,
+   [Brw_ADMI_SHR_DEG] = Brw_ADMI_SHR_DEG,
+   [Brw_ADMI_SHR_CTR] = Brw_ADMI_SHR_CTR,
+   [Brw_ADMI_SHR_INS] = Brw_ADMI_SHR_INS,
+   [Brw_ADMI_TCH_CRS] = Brw_ADMI_TCH_CRS,
+   [Brw_ADMI_TCH_GRP] = Brw_ADMI_TCH_GRP,
+   [Brw_ADMI_DOC_PRJ] = Brw_ADMI_DOC_PRJ,
+   [Brw_ADMI_ASS_PRJ] = Brw_ADMI_ASS_PRJ,
+  };
+
+// Browsers types for database "expanded_folders" table
+static const Brw_FileBrowser_t Brw_FileBrowserForDB_expanded_folders[Brw_NUM_TYPES_FILE_BROWSER] =
+  {
+   [Brw_UNKNOWN     ] = Brw_UNKNOWN,
+   [Brw_SHOW_DOC_CRS] = Brw_ADMI_DOC_CRS,
+   [Brw_SHOW_MRK_CRS] = Brw_ADMI_MRK_CRS,
+   [Brw_ADMI_DOC_CRS] = Brw_ADMI_DOC_CRS,
+   [Brw_ADMI_SHR_CRS] = Brw_ADMI_SHR_CRS,
+   [Brw_ADMI_SHR_GRP] = Brw_ADMI_SHR_GRP,
+   [Brw_ADMI_WRK_USR] = Brw_ADMI_WRK_USR,
+   [Brw_ADMI_WRK_CRS] = Brw_ADMI_WRK_CRS,
+   [Brw_ADMI_MRK_CRS] = Brw_ADMI_MRK_CRS,
+   [Brw_ADMI_BRF_USR] = Brw_ADMI_BRF_USR,
+   [Brw_SHOW_DOC_GRP] = Brw_ADMI_DOC_GRP,
+   [Brw_ADMI_DOC_GRP] = Brw_ADMI_DOC_GRP,
+   [Brw_SHOW_MRK_GRP] = Brw_ADMI_MRK_GRP,
+   [Brw_ADMI_MRK_GRP] = Brw_ADMI_MRK_GRP,
+   [Brw_ADMI_ASG_USR] = Brw_ADMI_ASG_USR,
+   [Brw_ADMI_ASG_CRS] = Brw_ADMI_ASG_CRS,
+   [Brw_SHOW_DOC_DEG] = Brw_ADMI_DOC_DEG,
+   [Brw_ADMI_DOC_DEG] = Brw_ADMI_DOC_DEG,
+   [Brw_SHOW_DOC_CTR] = Brw_ADMI_DOC_CTR,
+   [Brw_ADMI_DOC_CTR] = Brw_ADMI_DOC_CTR,
+   [Brw_SHOW_DOC_INS] = Brw_ADMI_DOC_INS,
+   [Brw_ADMI_DOC_INS] = Brw_ADMI_DOC_INS,
+   [Brw_ADMI_SHR_DEG] = Brw_ADMI_SHR_DEG,
+   [Brw_ADMI_SHR_CTR] = Brw_ADMI_SHR_CTR,
+   [Brw_ADMI_SHR_INS] = Brw_ADMI_SHR_INS,
+   [Brw_ADMI_TCH_CRS] = Brw_ADMI_TCH_CRS,
+   [Brw_ADMI_TCH_GRP] = Brw_ADMI_TCH_GRP,
+   [Brw_ADMI_DOC_PRJ] = Brw_ADMI_DOC_PRJ,
+   [Brw_ADMI_ASS_PRJ] = Brw_ADMI_ASS_PRJ,
+  };
+
 /*****************************************************************************/
 /***************************** Private variables *****************************/
 /*****************************************************************************/
@@ -96,36 +166,860 @@ extern struct Globals Gbl;
 /*****************************************************************************/
 
 /*****************************************************************************/
-/*********************** Store size of a file zone ***************************/
+/*********************** Get folders of assignments **************************/
+/*****************************************************************************/
+// Get folder of an assignment when:
+// 1. The assignment is visible (not hidden)
+// 2. ...and the folder name is not empty (the teacher has set that the user must send work(s) for that assignment)
+// 3. ...the assignment is not restricted to groups or (if restricted to groups), the owner of zone belong to any of the groups
+
+unsigned Brw_DB_GetFoldersAssignments (MYSQL_RES **mysql_res,long ZoneUsrCod)
+  {
+   return (unsigned)
+   DB_QuerySELECT (mysql_res,"can not get folders of assignments",
+		   "SELECT Folder"		// row[0]
+		    " FROM asg_assignments"
+		   " WHERE CrsCod=%ld"
+		     " AND Hidden='N'"
+		     " AND Folder<>''"
+		     " AND ("
+			   "AsgCod NOT IN"
+			   " (SELECT AsgCod"
+			      " FROM asg_groups)"
+			   " OR "
+			   "AsgCod IN"
+			   " (SELECT asg_groups.AsgCod"
+			      " FROM grp_users,"
+				    "asg_groups"
+			     " WHERE grp_users.UsrCod=%ld"
+			       " AND asg_groups.GrpCod=grp_users.GrpCod)"
+			  ")",
+		   Gbl.Hierarchy.Crs.CrsCod,
+		   ZoneUsrCod);
+  }
+
+/*****************************************************************************/
+/******** Remove files related to an institution from the database ***********/
 /*****************************************************************************/
 
-void Brw_DB_StoreSizeOfFileZone (void)
+void Brw_DB_RemoveInsFiles (long InsCod)
   {
-   extern const Brw_FileBrowser_t Brw_FileBrowserForDB_files[Brw_NUM_TYPES_FILE_BROWSER];
-   long Cod = Brw_GetCodForFileBrowser ();
-   long ZoneUsrCod = Brw_GetZoneUsrCodForFileBrowser ();
+   /***** Remove from database the entries that store the file views *****/
+   DB_QueryDELETE ("can not remove file views to files of an institution",
+		   "DELETE FROM brw_views"
+		   " USING brw_files,"
+		          "brw_views"
+		   " WHERE brw_files.FileBrowser IN (%u,%u)"
+		     " AND brw_files.Cod=%ld"
+		     " AND brw_files.FilCod=brw_views.FilCod",
+	           (unsigned) Brw_ADMI_DOC_INS,
+	           (unsigned) Brw_ADMI_SHR_INS,
+	           InsCod);
 
-   /***** Update size of the file browser in database *****/
-   DB_QueryREPLACE ("can not store the size of a file zone",
-		    "REPLACE INTO brw_sizes"
-		    " (FileBrowser,Cod,ZoneUsrCod,"
-		      "NumLevels,NumFolders,NumFiles,TotalSize)"
-		    " VALUES"
-		    " (%u,%ld,%ld,"
-		      "%u,'%lu','%lu','%llu')",
-	            (unsigned) Brw_FileBrowserForDB_files[Gbl.FileBrowser.Type],
-		    Cod,ZoneUsrCod,
-	            Gbl.FileBrowser.Size.NumLevls,
-	            Gbl.FileBrowser.Size.NumFolds,
-	            Gbl.FileBrowser.Size.NumFiles,
-	            Gbl.FileBrowser.Size.TotalSiz);
+   /***** Remove from database expanded folders *****/
+   DB_QueryDELETE ("can not remove expanded folders of an institution",
+		   "DELETE LOW_PRIORITY FROM brw_expanded"
+		   " WHERE FileBrowser IN (%u,%u)"
+		     " AND Cod=%ld",
+	           (unsigned) Brw_ADMI_DOC_INS,
+	           (unsigned) Brw_ADMI_SHR_INS,
+	           InsCod);
+
+   /***** Remove from database the entries that store clipboards *****/
+   DB_QueryDELETE ("can not remove clipboards"
+		   " related to files of an institution",
+		   "DELETE FROM brw_clipboards"
+		   " WHERE FileBrowser IN (%u,%u)"
+		     " AND Cod=%ld",
+	           (unsigned) Brw_ADMI_DOC_INS,
+	           (unsigned) Brw_ADMI_SHR_INS,
+	           InsCod);
+
+   /***** Remove from database the entries that store
+          the last time users visited file zones *****/
+   DB_QueryDELETE ("can not remove file last visits"
+		   " to files of an institution",
+		   "DELETE FROM brw_last"
+		   " WHERE FileBrowser IN (%u,%u)"
+		     " AND Cod=%ld",
+	           (unsigned) Brw_ADMI_DOC_INS,
+	           (unsigned) Brw_ADMI_SHR_INS,
+	           InsCod);
+
+   /***** Remove from database the entries that store
+          the sizes of the file zones *****/
+   DB_QueryDELETE ("can not remove sizes of file zones of an institution",
+		   "DELETE FROM brw_sizes"
+		   " WHERE FileBrowser IN (%u,%u)"
+		     " AND Cod=%ld",
+	           (unsigned) Brw_ADMI_DOC_INS,
+	           (unsigned) Brw_ADMI_SHR_INS,
+	           InsCod);
+
+   /***** Remove from database the entries that store the data files *****/
+   DB_QueryDELETE ("can not remove files of an institution",
+		   "DELETE FROM brw_files"
+		   " WHERE FileBrowser IN (%u,%u)"
+		     " AND Cod=%ld",
+	           (unsigned) Brw_ADMI_DOC_INS,
+	           (unsigned) Brw_ADMI_SHR_INS,
+	           InsCod);
+  }
+
+/*****************************************************************************/
+/************ Remove files related to a center from the database *************/
+/*****************************************************************************/
+
+void Brw_DB_RemoveCtrFiles (long CtrCod)
+  {
+   /***** Remove from database the entries that store the file views *****/
+   DB_QueryDELETE ("can not remove file views to files of a center",
+		   "DELETE FROM brw_views"
+		   " USING brw_files,"
+		          "brw_views"
+		   " WHERE brw_files.FileBrowser IN (%u,%u)"
+		     " AND brw_files.Cod=%ld"
+		     " AND brw_files.FilCod=brw_views.FilCod",
+	           (unsigned) Brw_ADMI_DOC_CTR,
+	           (unsigned) Brw_ADMI_SHR_CTR,
+	           CtrCod);
+
+   /***** Remove from database expanded folders *****/
+   DB_QueryDELETE ("can not remove expanded folders of a center",
+		   "DELETE LOW_PRIORITY FROM brw_expanded"
+		   " WHERE FileBrowser IN (%u,%u)"
+		     " AND Cod=%ld",
+	           (unsigned) Brw_ADMI_DOC_CTR,
+	           (unsigned) Brw_ADMI_SHR_CTR,
+	           CtrCod);
+
+   /***** Remove from database the entries that store clipboards *****/
+   DB_QueryDELETE ("can not remove clipboards related to files of a center",
+		   "DELETE FROM brw_clipboards"
+		   " WHERE FileBrowser IN (%u,%u)"
+		     " AND Cod=%ld",
+	           (unsigned) Brw_ADMI_DOC_CTR,
+	           (unsigned) Brw_ADMI_SHR_CTR,
+	           CtrCod);
+
+   /***** Remove from database the entries that store the last time users visited file zones *****/
+   DB_QueryDELETE ("can not remove file last visits to files of a center",
+		   "DELETE FROM brw_last"
+		   " WHERE FileBrowser IN (%u,%u)"
+		     " AND Cod=%ld",
+	           (unsigned) Brw_ADMI_DOC_CTR,
+	           (unsigned) Brw_ADMI_SHR_CTR,
+	           CtrCod);
+
+   /***** Remove from database the entries that store the sizes of the file zones *****/
+   DB_QueryDELETE ("can not remove sizes of file zones of a center",
+		   "DELETE FROM brw_sizes"
+		   " WHERE FileBrowser IN (%u,%u)"
+		     " AND Cod=%ld",
+	           (unsigned) Brw_ADMI_DOC_CTR,
+	           (unsigned) Brw_ADMI_SHR_CTR,
+	           CtrCod);
+
+   /***** Remove from database the entries that store the data files *****/
+   DB_QueryDELETE ("can not remove files of a center",
+		   "DELETE FROM brw_files"
+		   " WHERE FileBrowser IN (%u,%u)"
+		     " AND Cod=%ld",
+	           (unsigned) Brw_ADMI_DOC_CTR,
+	           (unsigned) Brw_ADMI_SHR_CTR,
+	           CtrCod);
+  }
+
+/*****************************************************************************/
+/************ Remove files related to a degree from the database *************/
+/*****************************************************************************/
+
+void Brw_DB_RemoveDegFiles (long DegCod)
+  {
+   /***** Remove from database the entries that store the file views *****/
+   DB_QueryDELETE ("can not remove file views to files of a degree",
+		   "DELETE FROM brw_views"
+		   " USING brw_files,"
+		          "brw_views"
+		   " WHERE brw_files.FileBrowser IN (%u,%u)"
+		     " AND brw_files.Cod=%ld"
+		     " AND brw_files.FilCod=brw_views.FilCod",
+	           (unsigned) Brw_ADMI_DOC_DEG,
+	           (unsigned) Brw_ADMI_SHR_DEG,
+	           DegCod);
+
+   /***** Remove from database expanded folders *****/
+   DB_QueryDELETE ("can not remove expanded folders of a degree",
+		   "DELETE LOW_PRIORITY FROM brw_expanded"
+		   " WHERE FileBrowser IN (%u,%u)"
+		     " AND Cod=%ld",
+	           (unsigned) Brw_ADMI_DOC_DEG,
+	           (unsigned) Brw_ADMI_SHR_DEG,
+	           DegCod);
+
+   /***** Remove from database the entries that store clipboards *****/
+   DB_QueryDELETE ("can not remove clipboards related to files of a degree",
+		   "DELETE FROM brw_clipboards"
+		   " WHERE FileBrowser IN (%u,%u)"
+		     " AND Cod=%ld",
+	           (unsigned) Brw_ADMI_DOC_DEG,
+	           (unsigned) Brw_ADMI_SHR_DEG,
+	           DegCod);
+
+   /***** Remove from database the entries that store the last time users visited file zones *****/
+   DB_QueryDELETE ("can not remove file last visits to files of a degree",
+		   "DELETE FROM brw_last"
+		   " WHERE FileBrowser IN (%u,%u)"
+		     " AND Cod=%ld",
+	           (unsigned) Brw_ADMI_DOC_DEG,
+	           (unsigned) Brw_ADMI_SHR_DEG,
+	           DegCod);
+
+   /***** Remove from database the entries that store the sizes of the file zones *****/
+   DB_QueryDELETE ("can not remove sizes of file zones of a degree",
+		   "DELETE FROM brw_sizes"
+		   " WHERE FileBrowser IN (%u,%u)"
+		     " AND Cod=%ld",
+	           (unsigned) Brw_ADMI_DOC_DEG,
+	           (unsigned) Brw_ADMI_SHR_DEG,
+	           DegCod);
+
+   /***** Remove from database the entries that store the data files *****/
+   DB_QueryDELETE ("can not remove files of a degree",
+		   "DELETE FROM brw_files"
+		   " WHERE FileBrowser IN (%u,%u)"
+		     " AND Cod=%ld",
+	           (unsigned) Brw_ADMI_DOC_DEG,
+	           (unsigned) Brw_ADMI_SHR_DEG,
+	           DegCod);
+  }
+
+/*****************************************************************************/
+/************ Remove files related to a course from the database *************/
+/*****************************************************************************/
+/* Remove information related to files in course,
+   including groups and projects,
+   so this function must be called
+   before removing groups and projects */
+
+void Brw_DB_RemoveCrsFiles (long CrsCod)
+  {
+   char SubqueryGrp[256];
+   char SubqueryPrj[128];
+
+   /***** Build subquery for groups *****/
+   sprintf (SubqueryGrp,"(SELECT grp_groups.GrpCod"
+	                  " FROM grp_types,"
+	                        "grp_groups"
+		         " WHERE grp_types.CrsCod=%ld"
+		           " AND grp_types.GrpTypCod=grp_groups.GrpTypCod)",
+            CrsCod);
+
+   /***** Build subquery for projects *****/
+   sprintf (SubqueryPrj,"(SELECT PrjCod"
+	                  " FROM prj_projects"
+	                 " WHERE CrsCod=%ld)",
+            CrsCod);
+
+   /***** Remove format of files of marks *****/
+   DB_QueryDELETE ("can not remove the properties of marks"
+		   " associated to a course",
+		   "DELETE FROM mrk_marks"
+		   " USING brw_files,"
+		          "mrk_marks"
+		   " WHERE brw_files.FileBrowser=%u"
+		     " AND brw_files.Cod=%ld"
+		     " AND brw_files.FilCod=mrk_marks.FilCod",
+	           (unsigned) Brw_ADMI_MRK_CRS,
+	           CrsCod);
+
+   /***** Remove from database the entries that store the file views *****/
+   /* Remove from course file zones */
+   DB_QueryDELETE ("can not remove file views to files of a course",
+		   "DELETE FROM brw_views"
+		   " USING brw_files,"
+		          "brw_views"
+		   " WHERE brw_files.FileBrowser IN (%u,%u,%u,%u,%u,%u)"
+		     " AND brw_files.Cod=%ld"
+		     " AND brw_files.FilCod=brw_views.FilCod",
+	           (unsigned) Brw_ADMI_DOC_CRS,
+	           (unsigned) Brw_ADMI_TCH_CRS,
+	           (unsigned) Brw_ADMI_SHR_CRS,
+	           (unsigned) Brw_ADMI_ASG_USR,
+	           (unsigned) Brw_ADMI_WRK_USR,
+	           (unsigned) Brw_ADMI_MRK_CRS,
+	           CrsCod);
+
+   /* Remove from group file zones */
+   DB_QueryDELETE ("can not remove file views to files of a course",
+		   "DELETE FROM brw_views"
+		   " USING brw_files,"
+		          "brw_views"
+		   " WHERE brw_files.FileBrowser IN (%u,%u,%u,%u)"
+		     " AND brw_files.Cod IN %s"
+		     " AND brw_files.FilCod=brw_views.FilCod",
+	           (unsigned) Brw_ADMI_DOC_GRP,
+	           (unsigned) Brw_ADMI_TCH_GRP,
+	           (unsigned) Brw_ADMI_SHR_GRP,
+	           (unsigned) Brw_ADMI_MRK_GRP,
+	           SubqueryGrp);
+
+   /* Remove from project file zones */
+   DB_QueryDELETE ("can not remove file views to files of a course",
+		   "DELETE FROM brw_views"
+		   " USING brw_files,"
+		          "brw_views"
+		   " WHERE brw_files.FileBrowser IN (%u,%u)"
+		     " AND brw_files.Cod IN %s"
+		     " AND brw_files.FilCod=brw_views.FilCod",
+	           (unsigned) Brw_ADMI_DOC_PRJ,
+	           (unsigned) Brw_ADMI_ASS_PRJ,
+	           SubqueryPrj);
+
+   /***** Remove from database expanded folders *****/
+   /* Remove from course file zones */
+   DB_QueryDELETE ("can not remove expanded folders of a course",
+		   "DELETE LOW_PRIORITY FROM brw_expanded"
+		   " WHERE FileBrowser IN (%u,%u,%u,%u,%u,%u,%u,%u)"
+		     " AND Cod=%ld",
+	           (unsigned) Brw_ADMI_DOC_CRS,
+	           (unsigned) Brw_ADMI_TCH_CRS,
+	           (unsigned) Brw_ADMI_SHR_CRS,
+	           (unsigned) Brw_ADMI_ASG_USR,
+	           (unsigned) Brw_ADMI_ASG_CRS,
+	           (unsigned) Brw_ADMI_WRK_USR,
+	           (unsigned) Brw_ADMI_WRK_CRS,
+	           (unsigned) Brw_ADMI_MRK_CRS,
+	           CrsCod);
+
+   /* Remove from group file zones */
+   DB_QueryDELETE ("can not remove expanded folders of a course",
+		   "DELETE LOW_PRIORITY FROM brw_expanded"
+		   " WHERE FileBrowser IN (%u,%u,%u,%u)"
+		     " AND Cod IN %s",
+	           (unsigned) Brw_ADMI_DOC_GRP,
+	           (unsigned) Brw_ADMI_TCH_GRP,
+	           (unsigned) Brw_ADMI_SHR_GRP,
+	           (unsigned) Brw_ADMI_MRK_GRP,
+	           SubqueryGrp);
+
+   /* Remove from project file zones */
+   DB_QueryDELETE ("can not remove expanded folders of a course",
+		   "DELETE LOW_PRIORITY FROM brw_expanded"
+		   " WHERE FileBrowser IN (%u,%u)"
+		     " AND Cod IN %s",
+	           (unsigned) Brw_ADMI_DOC_PRJ,
+	           (unsigned) Brw_ADMI_ASS_PRJ,
+	           SubqueryPrj);
+
+   /***** Remove from database the entries that store clipboards *****/
+   /* Remove from course file zones */
+   DB_QueryDELETE ("can not remove clipboards related to files of a course",
+		   "DELETE FROM brw_clipboards"
+		   " WHERE FileBrowser IN (%u,%u,%u,%u,%u,%u,%u,%u)"
+		     " AND Cod=%ld",
+	           (unsigned) Brw_ADMI_DOC_CRS,
+	           (unsigned) Brw_ADMI_TCH_CRS,
+	           (unsigned) Brw_ADMI_SHR_CRS,
+	           (unsigned) Brw_ADMI_ASG_USR,
+	           (unsigned) Brw_ADMI_ASG_CRS,
+	           (unsigned) Brw_ADMI_WRK_USR,
+	           (unsigned) Brw_ADMI_WRK_CRS,
+	           (unsigned) Brw_ADMI_MRK_CRS,
+	           CrsCod);
+
+   /* Remove from group file zones */
+   DB_QueryDELETE ("can not remove clipboards related to files of a course",
+		   "DELETE FROM brw_clipboards"
+		   " WHERE FileBrowser IN (%u,%u,%u,%u)"
+		     " AND Cod IN %s",
+	           (unsigned) Brw_ADMI_DOC_GRP,
+	           (unsigned) Brw_ADMI_TCH_GRP,
+	           (unsigned) Brw_ADMI_SHR_GRP,
+	           (unsigned) Brw_ADMI_MRK_GRP,
+	           SubqueryGrp);
+
+   /* Remove from project file zones */
+   DB_QueryDELETE ("can not remove clipboards related to files of a course",
+		   "DELETE FROM brw_clipboards"
+		   " WHERE FileBrowser IN (%u,%u)"
+		     " AND Cod IN %s",
+	           (unsigned) Brw_ADMI_DOC_PRJ,
+	           (unsigned) Brw_ADMI_ASS_PRJ,
+	           SubqueryPrj);
+
+   /***** Remove from database the entries that store the last time users visited file zones *****/
+   // Assignments and works are stored as one in brw_last...
+   // ...because a user views them at the same time
+   /* Remove from course file zones */
+   DB_QueryDELETE ("can not remove file last visits to files of a course",
+		   "DELETE FROM brw_last"
+		   " WHERE FileBrowser IN (%u,%u,%u,%u,%u)"
+		     " AND Cod=%ld",
+	           (unsigned) Brw_ADMI_DOC_CRS,
+	           (unsigned) Brw_ADMI_TCH_CRS,
+	           (unsigned) Brw_ADMI_SHR_CRS,
+	           (unsigned) Brw_ADMI_ASG_USR,
+	           (unsigned) Brw_ADMI_MRK_CRS,
+	           CrsCod);
+
+   /* Remove from group file zones */
+    DB_QueryDELETE ("can not remove file last visits to files of a course",
+		    "DELETE FROM brw_last"
+		   " WHERE FileBrowser IN (%u,%u,%u,%u)"
+		     " AND Cod IN %s",
+	           (unsigned) Brw_ADMI_DOC_GRP,
+	           (unsigned) Brw_ADMI_TCH_GRP,
+	           (unsigned) Brw_ADMI_SHR_GRP,
+	           (unsigned) Brw_ADMI_MRK_GRP,
+	           SubqueryGrp);
+
+   /* Remove from project file zones */
+   DB_QueryDELETE ("can not remove file last visits to files of a course",
+		   "DELETE FROM brw_last"
+		   " WHERE FileBrowser IN (%u,%u)"
+		     " AND Cod IN %s",
+	           (unsigned) Brw_ADMI_DOC_PRJ,
+	           (unsigned) Brw_ADMI_ASS_PRJ,
+	           SubqueryPrj);
+
+   /***** Remove from database the entries that store the sizes of the file zones *****/
+   /* Remove from course file zones */
+   DB_QueryDELETE ("can not remove sizes of file zones of a course",
+		   "DELETE FROM brw_sizes"
+		   " WHERE FileBrowser IN (%u,%u,%u,%u,%u,%u)"
+		     " AND Cod=%ld",
+	           (unsigned) Brw_ADMI_DOC_CRS,
+	           (unsigned) Brw_ADMI_TCH_CRS,
+	           (unsigned) Brw_ADMI_SHR_CRS,
+	           (unsigned) Brw_ADMI_ASG_USR,
+	           (unsigned) Brw_ADMI_WRK_USR,
+	           (unsigned) Brw_ADMI_MRK_CRS,
+	           CrsCod);
+
+   /* Remove from group file zones */
+   DB_QueryDELETE ("can not remove sizes of file zones of a course",
+		   "DELETE FROM brw_sizes"
+		   " WHERE FileBrowser IN (%u,%u,%u,%u)"
+		     " AND Cod IN %s",
+	           (unsigned) Brw_ADMI_DOC_GRP,
+	           (unsigned) Brw_ADMI_TCH_GRP,
+	           (unsigned) Brw_ADMI_SHR_GRP,
+	           (unsigned) Brw_ADMI_MRK_GRP,
+	           SubqueryGrp);
+
+   /* Remove from project file zones */
+   DB_QueryDELETE ("can not remove sizes of file zones of a course",
+		   "DELETE FROM brw_sizes"
+		   " WHERE FileBrowser IN (%u,%u)"
+		     " AND Cod IN %s",
+	           (unsigned) Brw_ADMI_DOC_PRJ,
+	           (unsigned) Brw_ADMI_ASS_PRJ,
+	           SubqueryPrj);
+
+   /***** Remove from database the entries that store the data files *****/
+   /* Remove from course file zones */
+   DB_QueryDELETE ("can not remove files of a course",
+		   "DELETE FROM brw_files"
+		   " WHERE FileBrowser IN (%u,%u,%u,%u,%u,%u)"
+		     " AND Cod=%ld",
+	           (unsigned) Brw_ADMI_DOC_CRS,
+	           (unsigned) Brw_ADMI_TCH_CRS,
+	           (unsigned) Brw_ADMI_SHR_CRS,
+	           (unsigned) Brw_ADMI_ASG_USR,
+	           (unsigned) Brw_ADMI_WRK_USR,
+	           (unsigned) Brw_ADMI_MRK_CRS,
+	           CrsCod);
+
+   /* Remove from group file zones */
+   DB_QueryDELETE ("can not remove files of a course",
+		   "DELETE FROM brw_files"
+		   " WHERE FileBrowser IN (%u,%u,%u,%u)"
+		     " AND Cod IN %s",
+	           (unsigned) Brw_ADMI_DOC_GRP,
+	           (unsigned) Brw_ADMI_TCH_GRP,
+	           (unsigned) Brw_ADMI_SHR_GRP,
+	           (unsigned) Brw_ADMI_MRK_GRP,
+	           SubqueryGrp);
+
+   /* Remove from project file zones */
+   DB_QueryDELETE ("can not remove files of a course",
+		   "DELETE FROM brw_files"
+		   " WHERE FileBrowser IN (%u,%u)"
+		     " AND Cod IN %s",
+	           (unsigned) Brw_ADMI_DOC_PRJ,
+	           (unsigned) Brw_ADMI_ASS_PRJ,
+	           SubqueryPrj);
+  }
+
+/*****************************************************************************/
+/************ Remove files related to a group from the database **************/
+/*****************************************************************************/
+
+void Brw_DB_RemoveGrpFiles (long GrpCod)
+  {
+   /***** Remove format of files of marks *****/
+   DB_QueryDELETE ("can not remove the properties of marks"
+		   " associated to a group",
+		   "DELETE FROM mrk_marks"
+		   " USING brw_files,"
+		          "mrk_marks"
+		   " WHERE brw_files.FileBrowser=%u"
+		     " AND brw_files.Cod=%ld"
+		     " AND brw_files.FilCod=mrk_marks.FilCod",
+	           (unsigned) Brw_ADMI_MRK_GRP,
+	           GrpCod);
+
+   /***** Remove from database the entries that store the file views *****/
+   DB_QueryDELETE ("can not remove file views to files of a group",
+		   "DELETE FROM brw_views"
+		   " USING brw_files,"
+		          "brw_views"
+		   " WHERE brw_files.FileBrowser IN (%u,%u,%u,%u)"
+		     " AND brw_files.Cod=%ld"
+		     " AND brw_files.FilCod=brw_views.FilCod",
+	           (unsigned) Brw_ADMI_DOC_GRP,
+	           (unsigned) Brw_ADMI_TCH_GRP,
+	           (unsigned) Brw_ADMI_SHR_GRP,
+	           (unsigned) Brw_ADMI_MRK_GRP,
+	           GrpCod);
+
+   /***** Remove from database expanded folders *****/
+   DB_QueryDELETE ("can not remove expanded folders of a group",
+		   "DELETE LOW_PRIORITY FROM brw_expanded"
+		   " WHERE FileBrowser IN (%u,%u,%u,%u)"
+		   " AND Cod=%ld",
+	           (unsigned) Brw_ADMI_DOC_GRP,
+	           (unsigned) Brw_ADMI_TCH_GRP,
+	           (unsigned) Brw_ADMI_SHR_GRP,
+	           (unsigned) Brw_ADMI_MRK_GRP,
+	           GrpCod);
+
+   /***** Remove from database the entries that store clipboards *****/
+   DB_QueryDELETE ("can not remove clipboards related to files of a group",
+		   "DELETE FROM brw_clipboards"
+		   " WHERE FileBrowser IN (%u,%u,%u,%u)"
+		     " AND Cod=%ld",
+	           (unsigned) Brw_ADMI_DOC_GRP,
+	           (unsigned) Brw_ADMI_TCH_GRP,
+	           (unsigned) Brw_ADMI_SHR_GRP,
+	           (unsigned) Brw_ADMI_MRK_GRP,
+	           GrpCod);
+
+   /***** Remove from database the entries that store the last time users visited file zones *****/
+   DB_QueryDELETE ("can not remove file last visits to files of a group",
+		   "DELETE FROM brw_last"
+		   " WHERE FileBrowser IN (%u,%u,%u,%u)"
+		   " AND Cod=%ld",
+	           (unsigned) Brw_ADMI_DOC_GRP,
+	           (unsigned) Brw_ADMI_TCH_GRP,
+	           (unsigned) Brw_ADMI_SHR_GRP,
+	           (unsigned) Brw_ADMI_MRK_GRP,
+	           GrpCod);
+
+   /***** Remove from database the entries that store the sizes of the file zones *****/
+   DB_QueryDELETE ("can not remove sizes of file zones of a group",
+		   "DELETE FROM brw_sizes"
+		   " WHERE FileBrowser IN (%u,%u,%u,%u)"
+		   " AND Cod=%ld",
+	           (unsigned) Brw_ADMI_DOC_GRP,
+	           (unsigned) Brw_ADMI_TCH_GRP,
+	           (unsigned) Brw_ADMI_SHR_GRP,
+	           (unsigned) Brw_ADMI_MRK_GRP,
+	           GrpCod);
+
+   /***** Remove from database the entries that store the data files *****/
+   DB_QueryDELETE ("can not remove files of a group",
+		   "DELETE FROM brw_files"
+		   " WHERE FileBrowser IN (%u,%u,%u,%u)"
+		     " AND Cod=%ld",
+	           (unsigned) Brw_ADMI_DOC_GRP,
+	           (unsigned) Brw_ADMI_TCH_GRP,
+	           (unsigned) Brw_ADMI_SHR_GRP,
+	           (unsigned) Brw_ADMI_MRK_GRP,
+	           GrpCod);
+  }
+
+/*****************************************************************************/
+/*********** Remove files related to a project from the database *************/
+/*****************************************************************************/
+
+void Brw_DB_RemovePrjFiles (long PrjCod)
+  {
+   /***** Remove from database the entries that store the file views *****/
+   DB_QueryDELETE ("can not remove file views to files of a project",
+		   "DELETE FROM brw_views"
+		   " USING brw_files,"
+		          "brw_views"
+		   " WHERE brw_files.FileBrowser IN (%u,%u)"
+		     " AND brw_files.Cod=%ld"
+		     " AND brw_files.FilCod=brw_views.FilCod",
+	           (unsigned) Brw_ADMI_DOC_PRJ,
+	           (unsigned) Brw_ADMI_ASS_PRJ,
+	           PrjCod);
+
+   /***** Remove from database expanded folders *****/
+   DB_QueryDELETE ("can not remove expanded folders of a project",
+		   "DELETE LOW_PRIORITY FROM brw_expanded"
+		   " WHERE FileBrowser IN (%u,%u)"
+		     " AND Cod=%ld",
+	           (unsigned) Brw_ADMI_DOC_PRJ,
+	           (unsigned) Brw_ADMI_ASS_PRJ,
+	           PrjCod);
+
+   /***** Remove from database the entries that store clipboards *****/
+   DB_QueryDELETE ("can not remove clipboards related to files of a project",
+		   "DELETE FROM brw_clipboards"
+		   " WHERE FileBrowser IN (%u,%u)"
+		     " AND Cod=%ld",
+	           (unsigned) Brw_ADMI_DOC_PRJ,
+	           (unsigned) Brw_ADMI_ASS_PRJ,
+	           PrjCod);
+
+   /***** Remove from database the entries that store the last time users visited file zones *****/
+   DB_QueryDELETE ("can not remove file last visits to files of a project",
+		   "DELETE FROM brw_last"
+		   " WHERE FileBrowser IN (%u,%u)"
+		     " AND Cod=%ld",
+	           (unsigned) Brw_ADMI_DOC_PRJ,
+	           (unsigned) Brw_ADMI_ASS_PRJ,
+	           PrjCod);
+
+   /***** Remove from database the entries that store the sizes of the file zones *****/
+   DB_QueryDELETE ("can not remove sizes of file zones of a project",
+		   "DELETE FROM brw_sizes"
+		   " WHERE FileBrowser IN (%u,%u)"
+		     " AND Cod=%ld",
+	           (unsigned) Brw_ADMI_DOC_PRJ,
+	           (unsigned) Brw_ADMI_ASS_PRJ,
+	           PrjCod);
+
+   /***** Remove from database the entries that store the data files *****/
+   DB_QueryDELETE ("can not remove files of a project",
+		   "DELETE FROM brw_files"
+		   " WHERE FileBrowser IN (%u,%u)"
+		     " AND Cod=%ld",
+	           (unsigned) Brw_ADMI_DOC_PRJ,
+	           (unsigned) Brw_ADMI_ASS_PRJ,
+	           PrjCod);
+  }
+
+/*****************************************************************************/
+/* Remove some info about files related to a course and a user from database */
+/*****************************************************************************/
+
+void Brw_DB_RemoveSomeInfoAboutCrsUsrFiles (long UsrCod,long CrsCod)
+  {
+   /***** Remove from database expanded folders *****/
+   DB_QueryDELETE ("can not remove expanded folders for a user in a course",
+		   "DELETE LOW_PRIORITY FROM brw_expanded"
+		   " WHERE UsrCod=%ld"
+		     " AND ("
+			    "(FileBrowser IN (%u,%u,%u,%u,%u,%u,%u,%u)"
+			    " AND Cod=%ld)"
+			    " OR "
+			    "(FileBrowser IN (%u,%u,%u,%u)"
+			    " AND Cod IN"
+			    " (SELECT grp_groups.GrpCod"
+			       " FROM grp_types,"
+			             "grp_groups"
+			      " WHERE grp_types.CrsCod=%ld"
+			        " AND grp_types.GrpTypCod=grp_groups.GrpTypCod))"
+		          ")",
+	           UsrCod,
+	           (unsigned) Brw_ADMI_DOC_CRS,
+	           (unsigned) Brw_ADMI_TCH_CRS,
+	           (unsigned) Brw_ADMI_SHR_CRS,
+	           (unsigned) Brw_ADMI_ASG_USR,
+	           (unsigned) Brw_ADMI_ASG_CRS,
+	           (unsigned) Brw_ADMI_WRK_USR,
+	           (unsigned) Brw_ADMI_WRK_CRS,
+	           (unsigned) Brw_ADMI_MRK_CRS,
+	           CrsCod,
+	           (unsigned) Brw_ADMI_DOC_GRP,
+	           (unsigned) Brw_ADMI_TCH_GRP,
+	           (unsigned) Brw_ADMI_SHR_GRP,
+	           (unsigned) Brw_ADMI_MRK_GRP,
+	           CrsCod);
+
+   /***** Remove from database the entries that store clipboards *****/
+   DB_QueryDELETE ("can not remove source of copy for a user in a course",
+		   "DELETE FROM brw_clipboards"
+		   " WHERE UsrCod=%ld"
+		     " AND ("
+			    "(FileBrowser IN (%u,%u,%u,%u,%u,%u,%u,%u)"
+			    " AND Cod=%ld)"
+			    " OR "
+			    "(FileBrowser IN (%u,%u,%u,%u)"
+			    " AND Cod IN"
+			    " (SELECT grp_groups.GrpCod"
+			       " FROM grp_types,"
+			             "grp_groups"
+			      " WHERE grp_types.CrsCod=%ld"
+			        " AND grp_types.GrpTypCod=grp_groups.GrpTypCod))"
+		          ")",
+	           UsrCod,
+	           (unsigned) Brw_ADMI_DOC_CRS,
+	           (unsigned) Brw_ADMI_TCH_CRS,
+	           (unsigned) Brw_ADMI_SHR_CRS,
+	           (unsigned) Brw_ADMI_ASG_USR,
+	           (unsigned) Brw_ADMI_ASG_CRS,
+	           (unsigned) Brw_ADMI_WRK_USR,
+	           (unsigned) Brw_ADMI_WRK_CRS,
+	           (unsigned) Brw_ADMI_MRK_CRS,
+	           CrsCod,
+	           (unsigned) Brw_ADMI_DOC_GRP,
+	           (unsigned) Brw_ADMI_TCH_GRP,
+	           (unsigned) Brw_ADMI_SHR_GRP,
+	           (unsigned) Brw_ADMI_MRK_GRP,
+	           CrsCod);
+
+   /***** Remove from database the entries that store the last time user visited file zones *****/
+   // Assignments and works are stored as one in brw_last...
+   // ...because a user views them at the same time
+   DB_QueryDELETE ("can not remove file last visits to files of a course"
+		   " from a user",
+		   "DELETE FROM brw_last"
+		   " WHERE UsrCod=%ld"
+		     " AND ("
+			    "(FileBrowser IN (%u,%u,%u,%u,%u)"
+			    " AND Cod=%ld)"
+			    " OR "
+			    "(FileBrowser IN (%u,%u,%u,%u)"
+			    " AND Cod IN"
+			    " (SELECT grp_groups.GrpCod"
+			       " FROM grp_types,"
+			             "grp_groups"
+			      " WHERE grp_types.CrsCod=%ld"
+			        " AND grp_types.GrpTypCod=grp_groups.GrpTypCod))"
+		          ")",
+	           UsrCod,
+	           (unsigned) Brw_ADMI_DOC_CRS,
+	           (unsigned) Brw_ADMI_TCH_CRS,
+	           (unsigned) Brw_ADMI_SHR_CRS,
+	           (unsigned) Brw_ADMI_ASG_USR,
+	           (unsigned) Brw_ADMI_MRK_CRS,
+	           CrsCod,
+	           (unsigned) Brw_ADMI_DOC_GRP,
+	           (unsigned) Brw_ADMI_TCH_GRP,
+	           (unsigned) Brw_ADMI_SHR_GRP,
+	           (unsigned) Brw_ADMI_MRK_GRP,
+	           CrsCod);
+  }
+
+/*****************************************************************************/
+/*************** Remove user's works in a course from database ***************/
+/*****************************************************************************/
+
+void Brw_DB_RemoveWrkFiles (long CrsCod,long UsrCod)
+  {
+   /***** Remove from database the entries that store the file views *****/
+   DB_QueryDELETE ("can not remove file views",
+		   "DELETE FROM brw_views"
+		   " USING brw_files,"
+		          "brw_views"
+		   " WHERE brw_files.FileBrowser IN (%u,%u)"
+		     " AND brw_files.Cod=%ld"
+		     " AND brw_files.ZoneUsrCod=%ld"
+		     " AND brw_files.FilCod=brw_views.FilCod",
+	           (unsigned) Brw_ADMI_ASG_USR,
+	           (unsigned) Brw_ADMI_WRK_USR,
+	           CrsCod,UsrCod);
+
+   /***** Remove from database expanded folders *****/
+   DB_QueryDELETE ("can not remove expanded folders of a group",
+		   "DELETE LOW_PRIORITY FROM brw_expanded"
+		   " WHERE FileBrowser IN (%u,%u)"
+		     " AND Cod=%ld"
+		     " AND WorksUsrCod=%ld",
+	           (unsigned) Brw_ADMI_ASG_CRS,
+	           (unsigned) Brw_ADMI_WRK_CRS,
+	           CrsCod,UsrCod);
+
+   /***** Remove from database the entries that store clipboards *****/
+   DB_QueryDELETE ("can not remove clipboards",
+		   "DELETE FROM brw_clipboards"
+		   " WHERE FileBrowser IN (%u,%u)"
+		     " AND Cod=%ld"
+		     " AND WorksUsrCod=%ld",
+	           (unsigned) Brw_ADMI_ASG_CRS,
+	           (unsigned) Brw_ADMI_WRK_CRS,
+	           CrsCod,UsrCod);
+
+   /***** Remove from database the entries that store the sizes of the file zones *****/
+   DB_QueryDELETE ("can not remove file browser sizes",
+		   "DELETE FROM brw_sizes"
+		   " WHERE FileBrowser IN (%u,%u)"
+		     " AND Cod=%ld"
+		     " AND ZoneUsrCod=%ld",
+	           (unsigned) Brw_ADMI_ASG_USR,
+	           (unsigned) Brw_ADMI_WRK_USR,
+	           CrsCod,UsrCod);
+
+   /***** Remove from database the entries that store the data files *****/
+   DB_QueryDELETE ("can not remove files",
+		   "DELETE FROM brw_files"
+		   " WHERE FileBrowser IN (%u,%u)"
+		     " AND Cod=%ld"
+		     " AND ZoneUsrCod=%ld",
+	           (unsigned) Brw_ADMI_ASG_USR,
+	           (unsigned) Brw_ADMI_WRK_USR,
+	           CrsCod,UsrCod);
+  }
+
+/*****************************************************************************/
+/************* Remove files related to a user from the database **************/
+/*****************************************************************************/
+
+void Brw_DB_RemoveUsrFiles (long UsrCod)
+  {
+   /***** Remove from database the entries that store the file views *****/
+   // User is not removed from brw_views table,
+   // in order to take into account his/her views
+   DB_QueryDELETE ("can not remove file views to files of a user",
+		   "DELETE FROM brw_views"
+		   " USING brw_files,"
+		          "brw_views"
+		   " WHERE brw_files.ZoneUsrCod=%ld"
+		     " AND brw_files.FilCod=brw_views.FilCod",
+	           UsrCod);
+
+   /***** Remove from database expanded folders *****/
+   DB_QueryDELETE ("can not remove expanded folders for a user",
+		   "DELETE LOW_PRIORITY FROM brw_expanded"
+		   " WHERE UsrCod=%ld",
+	           UsrCod);
+
+   /***** Remove from database the entries that store clipboards *****/
+   DB_QueryDELETE ("can not remove user's clipboards",
+		   "DELETE FROM brw_clipboards"
+		   " WHERE UsrCod=%ld",	// User's clipboard
+	           UsrCod);
+
+   /***** Remove from database the entries that store the last time users visited file zones *****/
+   DB_QueryDELETE ("can not remove user's last visits to file zones",
+		   "DELETE FROM brw_last"
+		   " WHERE UsrCod=%ld",	// User's last visits to all zones
+	           UsrCod);
+
+   /***** Remove from database the entries that store the sizes of the file zones *****/
+   DB_QueryDELETE ("can not remove sizes of user's file zones",
+		   "DELETE FROM brw_sizes"
+		   " WHERE ZoneUsrCod=%ld",
+	           UsrCod);
+
+   /***** Remove from database the entries that store the data files *****/
+   DB_QueryDELETE ("can not remove files in user's file zones",
+		   "DELETE FROM brw_files"
+		   " WHERE ZoneUsrCod=%ld",
+	           UsrCod);
   }
 
 /*****************************************************************************/
 /************ Update the date of my last access to file browser **************/
 /*****************************************************************************/
 
-void Brw_DB_UpdateDateMyLastAccFileBrowser (Brw_FileBrowser_t FileBrowser)
+void Brw_DB_UpdateDateMyLastAccFileBrowser (void)
   {
    long Cod = Brw_GetCodForFileBrowser ();
 
@@ -135,7 +1029,7 @@ void Brw_DB_UpdateDateMyLastAccFileBrowser (Brw_FileBrowser_t FileBrowser)
 		    " VALUES"
 		    " (%ld,%u,%ld,NOW())",
 	            Gbl.Usrs.Me.UsrDat.UsrCod,
-	            (unsigned) FileBrowser,
+	            (unsigned) Brw_FileBrowserForDB_file_browser_last[Gbl.FileBrowser.Type],
 	            Cod);
   }
 
@@ -143,8 +1037,7 @@ void Brw_DB_UpdateDateMyLastAccFileBrowser (Brw_FileBrowser_t FileBrowser)
 /************** Get the date of my last access to file browser ***************/
 /*****************************************************************************/
 
-unsigned Brw_DB_GetDateMyLastAccFileBrowser (MYSQL_RES **mysql_res,
-                                             Brw_FileBrowser_t FileBrowser)
+unsigned Brw_DB_GetDateMyLastAccFileBrowser (MYSQL_RES **mysql_res)
   {
    long Cod = Brw_GetCodForFileBrowser ();
 
@@ -157,7 +1050,7 @@ unsigned Brw_DB_GetDateMyLastAccFileBrowser (MYSQL_RES **mysql_res,
 		     " AND FileBrowser=%u"
 		     " AND Cod=%ld",
 		   Gbl.Usrs.Me.UsrDat.UsrCod,
-		   (unsigned) FileBrowser,
+		   (unsigned) Brw_FileBrowserForDB_file_browser_last[Gbl.FileBrowser.Type],
 		   Cod);
   }
 
@@ -179,6 +1072,370 @@ unsigned Brw_DB_GetGrpLastAccFileBrowser (MYSQL_RES **mysql_res,const char *Fiel
 		   Gbl.Hierarchy.Crs.CrsCod);
   }
 
+/*****************************************************************************/
+/************** Check if a file / folder from is set as hidden ***************/
+/*****************************************************************************/
+
+unsigned Brw_DB_CheckIfFileOrFolderIsSetAsHiddenUsingPath (MYSQL_RES **mysql_res,
+                                                           const char *Path)
+  {
+   extern const Brw_FileBrowser_t Brw_FileBrowserForDB_files[Brw_NUM_TYPES_FILE_BROWSER];
+   long Cod = Brw_GetCodForFileBrowser ();
+   long ZoneUsrCod = Brw_GetZoneUsrCodForFileBrowser ();
+
+   return (unsigned)
+   DB_QuerySELECT (mysql_res,"can not check if a file is hidden",
+		   "SELECT Hidden"		// row[0]
+		    " FROM brw_files"
+		   " WHERE FileBrowser=%u"
+		     " AND Cod=%ld"
+		     " AND ZoneUsrCod=%ld"
+		     " AND Path='%s'",
+		   (unsigned) Brw_FileBrowserForDB_files[Gbl.FileBrowser.Type],
+		   Cod,
+		   ZoneUsrCod,
+		   Path);
+  }
+
+/*****************************************************************************/
+/******** Check if a file / folder from the documents zone is hidden *********/
+/*****************************************************************************/
+
+bool Brw_DB_CheckIfFileOrFolderIsSetAsHiddenUsingMetadata (const struct FileMetadata *FileMetadata)
+  {
+   /***** Get if a file or folder is under a hidden folder from database *****/
+   /*
+      The argument Path passed to this function is hidden if:
+      1) the argument Path is exactly the same as a path stored in database
+         or
+      2) the argument Path begins by 'x/', where x is a path stored in database
+   */
+   return (DB_QueryCOUNT ("can not check if a file or folder is hidden",
+			  "SELECT COUNT(*)"
+			   " FROM brw_files"
+			  " WHERE FileBrowser=%u"
+			    " AND Cod=%ld"
+			    " AND ZoneUsrCod=%ld"
+			    " AND Hidden='Y'"
+			    " AND (Path='%s'"
+			         " OR"
+			         " LOCATE(CONCAT(Path,'/'),'%s')=1)",
+			  FileMetadata->FileBrowser,
+			  FileMetadata->Cod,
+			  FileMetadata->ZoneUsrCod,
+			  FileMetadata->FilFolLnk.Full,
+			  FileMetadata->FilFolLnk.Full) != 0);
+  }
+
+/*****************************************************************************/
+/************************* Insert path in expanded folders *******************/
+/*****************************************************************************/
+
+void Brw_DB_InsertFolderInExpandedFolders (const char Path[PATH_MAX + 1])
+  {
+   long Cod = Brw_GetCodForFileBrowser ();
+   long WorksUsrCod = Brw_GetZoneUsrCodForFileBrowser ();
+
+   // Path must be stored with final '/'
+   DB_QueryINSERT ("can not expand the content of a folder",
+		   "INSERT INTO brw_expanded"
+		   " (UsrCod,FileBrowser,Cod,WorksUsrCod,Path,ClickTime)"
+		   " VALUES"
+		   " (%ld,%u,%ld,%ld,'%s/',NOW())",
+	           Gbl.Usrs.Me.UsrDat.UsrCod,
+	           (unsigned) Brw_FileBrowserForDB_expanded_folders[Gbl.FileBrowser.Type],
+	           Cod,
+	           WorksUsrCod,
+	           Path);
+  }
+
+/*****************************************************************************/
+/******* Update paths of the current file browser in expanded folders ********/
+/*****************************************************************************/
+
+void Brw_DB_UpdateClickTimeOfThisFileBrowserInExpandedFolders (void)
+  {
+   long Cod = Brw_GetCodForFileBrowser ();
+   long WorksUsrCod = Brw_GetZoneUsrCodForFileBrowser ();
+   Brw_FileBrowser_t FileBrowserForExpandedFolders = Brw_FileBrowserForDB_expanded_folders[Gbl.FileBrowser.Type];
+
+   if (Cod > 0)
+     {
+      if (WorksUsrCod > 0)
+	 DB_QueryUPDATE ("can not update expanded folder",
+			 "UPDATE brw_expanded"
+			   " SET ClickTime=NOW()"
+			 " WHERE UsrCod=%ld"
+			   " AND FileBrowser=%u"
+			   " AND Cod=%ld"
+			   " AND WorksUsrCod=%ld",
+		         Gbl.Usrs.Me.UsrDat.UsrCod,
+		         (unsigned) FileBrowserForExpandedFolders,
+		         Cod,
+		         WorksUsrCod);
+      else
+	 DB_QueryUPDATE ("can not update expanded folder",
+			 "UPDATE brw_expanded"
+			   " SET ClickTime=NOW()"
+			 " WHERE UsrCod=%ld"
+			   " AND FileBrowser=%u"
+			   " AND Cod=%ld",
+		         Gbl.Usrs.Me.UsrDat.UsrCod,
+		         (unsigned) FileBrowserForExpandedFolders,
+		         Cod);
+     }
+   else	// Briefcase
+      DB_QueryUPDATE ("can not update expanded folder",
+		      "UPDATE brw_expanded"
+		        " SET ClickTime=NOW()"
+		      " WHERE UsrCod=%ld"
+		        " AND FileBrowser=%u",
+	              Gbl.Usrs.Me.UsrDat.UsrCod,
+	              (unsigned) FileBrowserForExpandedFolders);
+  }
+
+/*****************************************************************************/
+/************* Check if a folder from a file browser is expanded *************/
+/*****************************************************************************/
+
+bool Brw_DB_GetIfExpandedFolder (const char Path[PATH_MAX + 1])
+  {
+   long Cod = Brw_GetCodForFileBrowser ();
+   long WorksUsrCod = Brw_GetZoneUsrCodForFileBrowser ();
+   Brw_FileBrowser_t FileBrowserForExpandedFolders = Brw_FileBrowserForDB_expanded_folders[Gbl.FileBrowser.Type];
+
+   if (Cod > 0)
+     {
+      if (WorksUsrCod > 0)
+         return (DB_QueryCOUNT ("can not get check if a folder is expanded",
+			        "SELECT COUNT(*)"
+			         " FROM brw_expanded"
+			        " WHERE UsrCod=%ld"
+				  " AND FileBrowser=%u"
+				  " AND Cod=%ld"
+				  " AND WorksUsrCod=%ld"
+				  " AND Path='%s/'",
+			        Gbl.Usrs.Me.UsrDat.UsrCod,
+			        (unsigned) FileBrowserForExpandedFolders,
+			        Cod,
+			        WorksUsrCod,
+			        Path) != 0);
+      else
+         return (DB_QueryCOUNT ("can not get check if a folder is expanded",
+				"SELECT COUNT(*)"
+				 " FROM brw_expanded"
+				" WHERE UsrCod=%ld"
+				  " AND FileBrowser=%u"
+				  " AND Cod=%ld"
+				  " AND Path='%s/'",
+				Gbl.Usrs.Me.UsrDat.UsrCod,
+				(unsigned) FileBrowserForExpandedFolders,
+				Cod,
+				Path) != 0);
+     }
+   else	// Briefcase
+      return (DB_QueryCOUNT ("can not get check if a folder is expanded",
+			     "SELECT COUNT(*)"
+			      " FROM brw_expanded"
+			     " WHERE UsrCod=%ld"
+			       " AND FileBrowser=%u"
+			       " AND Path='%s/'",
+			     Gbl.Usrs.Me.UsrDat.UsrCod,
+			     (unsigned) FileBrowserForExpandedFolders,
+			     Path) != 0);
+  }
+
+/*****************************************************************************/
+/********************** Remove path from expanded folders ********************/
+/*****************************************************************************/
+
+void Brw_DB_RemoveFolderFromExpandedFolders (const char Path[PATH_MAX + 1])
+  {
+   long Cod = Brw_GetCodForFileBrowser ();
+   long WorksUsrCod = Brw_GetZoneUsrCodForFileBrowser ();
+   Brw_FileBrowser_t FileBrowserForExpandedFolders = Brw_FileBrowserForDB_expanded_folders[Gbl.FileBrowser.Type];
+
+   if (Cod > 0)
+     {
+      if (WorksUsrCod > 0)
+         DB_QueryDELETE ("can not contract the content of a folder",
+			 "DELETE FROM brw_expanded"
+			 " WHERE UsrCod=%ld"
+			   " AND FileBrowser=%u"
+			   " AND Cod=%ld"
+			   " AND WorksUsrCod=%ld"
+			   " AND Path='%s/'",
+		         Gbl.Usrs.Me.UsrDat.UsrCod,
+		         (unsigned) FileBrowserForExpandedFolders,
+		         Cod,WorksUsrCod,Path);
+      else
+	 DB_QueryDELETE ("can not contract the content of a folder",
+		         "DELETE FROM brw_expanded"
+			 " WHERE UsrCod=%ld"
+			   " AND FileBrowser=%u"
+			   " AND Cod=%ld"
+			   " AND Path='%s/'",
+		         Gbl.Usrs.Me.UsrDat.UsrCod,
+		         (unsigned) FileBrowserForExpandedFolders,
+		         Cod,Path);
+     }
+   else	// Briefcase
+      DB_QueryDELETE ("can not contract the content of a folder",
+		      "DELETE FROM brw_expanded"
+		      " WHERE UsrCod=%ld"
+		        " AND FileBrowser=%u"
+		        " AND Path='%s/'",
+	              Gbl.Usrs.Me.UsrDat.UsrCod,
+	              (unsigned) FileBrowserForExpandedFolders,
+	              Path);
+  }
+
+/*****************************************************************************/
+/***** Remove expanded folders with paths from a course or from a user *******/
+/*****************************************************************************/
+
+void Brw_DB_RemoveAffectedExpandedFolders (const char Path[PATH_MAX + 1])
+  {
+   long Cod = Brw_GetCodForFileBrowser ();
+   long WorksUsrCod = Brw_GetZoneUsrCodForFileBrowser ();
+   Brw_FileBrowser_t FileBrowserForExpandedFolders = Brw_FileBrowserForDB_expanded_folders[Gbl.FileBrowser.Type];
+
+   if (Cod > 0)
+     {
+      if (WorksUsrCod > 0)
+         DB_QueryDELETE ("can not remove expanded folders",
+			 "DELETE FROM brw_expanded"
+			 " WHERE UsrCod=%ld"
+			   " AND FileBrowser=%u"
+			   " AND Cod=%ld"
+			   " AND WorksUsrCod=%ld"
+			   " AND Path LIKE '%s/%%'",
+		         Gbl.Usrs.Me.UsrDat.UsrCod,
+		         (unsigned) FileBrowserForExpandedFolders,
+		         Cod,
+		         WorksUsrCod,
+		         Path);
+      else
+         DB_QueryDELETE ("can not remove expanded folders",
+			 "DELETE FROM brw_expanded"
+			 " WHERE UsrCod=%ld"
+			   " AND FileBrowser=%u"
+			   " AND Cod=%ld"
+			   " AND Path LIKE '%s/%%'",
+		         Gbl.Usrs.Me.UsrDat.UsrCod,
+		         (unsigned) FileBrowserForExpandedFolders,
+		         Cod,
+		         Path);
+     }
+   else	// Briefcase
+      DB_QueryDELETE ("can not remove expanded folders",
+		      "DELETE FROM brw_expanded"
+		      " WHERE UsrCod=%ld"
+		        " AND FileBrowser=%u"
+		        " AND Path LIKE '%s/%%'",
+		      Gbl.Usrs.Me.UsrDat.UsrCod,
+		      (unsigned) FileBrowserForExpandedFolders,
+		      Path);
+  }
+
+/*****************************************************************************/
+/***** Remove expanded folders with paths from a course or from a user *******/
+/*****************************************************************************/
+
+void Brw_DB_RenameAffectedExpandedFolders (Brw_FileBrowser_t FileBrowser,
+                                           long MyUsrCod,long WorksUsrCod,
+                                           const char *OldPath,const char *NewPath)
+  {
+   long Cod = Brw_GetCodForFileBrowser ();
+   Brw_FileBrowser_t FileBrowserForExpandedFolders = Brw_FileBrowserForDB_expanded_folders[FileBrowser];
+   unsigned StartFinalSubpathNotChanged = strlen (OldPath) + 2;
+
+   if (Cod > 0)
+     {
+      if (MyUsrCod > 0)
+	{
+	 if (WorksUsrCod > 0)
+	    DB_QueryUPDATE ("can not update expanded folders",
+			    "UPDATE brw_expanded"
+			      " SET Path=CONCAT('%s','/',SUBSTRING(Path,%u))"
+			    " WHERE UsrCod=%ld"
+			      " AND FileBrowser=%u"
+			      " AND Cod=%ld"
+			      " AND WorksUsrCod=%ld"
+			      " AND Path LIKE '%s/%%'",
+		            NewPath,StartFinalSubpathNotChanged,
+		            MyUsrCod,
+		            (unsigned) FileBrowserForExpandedFolders,
+		            Cod,
+		            WorksUsrCod,
+		            OldPath);
+	 else
+	    DB_QueryUPDATE ("can not update expanded folders",
+			    "UPDATE brw_expanded"
+			      " SET Path=CONCAT('%s','/',SUBSTRING(Path,%u))"
+			    " WHERE UsrCod=%ld"
+			      " AND FileBrowser=%u"
+			      " AND Cod=%ld"
+			      " AND Path LIKE '%s/%%'",
+		            NewPath,StartFinalSubpathNotChanged,
+		            MyUsrCod,
+		            (unsigned) FileBrowserForExpandedFolders,
+		            Cod,
+		            OldPath);
+	}
+      else	// MyUsrCod <= 0 means expanded folders for any user
+	{
+	 if (WorksUsrCod > 0)
+	    DB_QueryUPDATE ("can not update expanded folders",
+			    "UPDATE brw_expanded"
+			      " SET Path=CONCAT('%s','/',SUBSTRING(Path,%u))"
+			    " WHERE FileBrowser=%u"
+			      " AND Cod=%ld"
+			      " AND WorksUsrCod=%ld"
+			      " AND Path LIKE '%s/%%'",
+		            NewPath,StartFinalSubpathNotChanged,
+		            (unsigned) FileBrowserForExpandedFolders,
+		            Cod,
+		            WorksUsrCod,
+		            OldPath);
+	 else
+	    DB_QueryUPDATE ("can not update expanded folders",
+			    "UPDATE brw_expanded"
+			      " SET Path=CONCAT('%s','/',SUBSTRING(Path,%u))"
+			    " WHERE FileBrowser=%u"
+			      " AND Cod=%ld"
+			      " AND Path LIKE '%s/%%'",
+			    NewPath,StartFinalSubpathNotChanged,
+			    (unsigned) FileBrowserForExpandedFolders,
+			    Cod,
+			    OldPath);
+	}
+     }
+   else	// Briefcase
+      DB_QueryUPDATE ("can not update expanded folders",
+		      "UPDATE brw_expanded"
+		        " SET Path=CONCAT('%s','/',SUBSTRING(Path,%u))"
+		      " WHERE UsrCod=%ld"
+		        " AND FileBrowser=%u"
+		        " AND Path LIKE '%s/%%'",
+	              NewPath,StartFinalSubpathNotChanged,
+	              MyUsrCod,
+	              (unsigned) FileBrowserForExpandedFolders,
+	              OldPath);
+  }
+
+/*****************************************************************************/
+/************* Remove expired expanded folders (from all users) **************/
+/*****************************************************************************/
+
+void Brw_DB_RemoveExpiredExpandedFolders (void)
+  {
+   DB_QueryDELETE ("can not remove old expanded folders",
+		   "DELETE LOW_PRIORITY FROM brw_expanded"
+		   " WHERE ClickTime<FROM_UNIXTIME(UNIX_TIMESTAMP()-%lu)",
+                   Cfg_TIME_TO_DELETE_BROWSER_EXPANDED_FOLDERS);
+  }
+
 /*****************************************************************************/
 /***************************** Add path to clipboards ************************/
 /*****************************************************************************/
@@ -247,36 +1504,140 @@ unsigned Brw_DB_GetMyClipboard (MYSQL_RES **mysql_res)
   }
 
 /*****************************************************************************/
-/*********************** Get folders of assignments **************************/
+/****************** Remove expired clipboards (from all users) ***************/
 /*****************************************************************************/
-// Get folder of an assignment when:
-// 1. The assignment is visible (not hidden)
-// 2. ...and the folder name is not empty (the teacher has set that the user must send work(s) for that assignment)
-// 3. ...the assignment is not restricted to groups or (if restricted to groups), the owner of zone belong to any of the groups
 
-unsigned Brw_DB_GetFoldersAssignments (MYSQL_RES **mysql_res,long ZoneUsrCod)
+void Brw_DB_RemoveExpiredClipboards (void)
   {
-   return (unsigned)
-   DB_QuerySELECT (mysql_res,"can not get folders of assignments",
-		   "SELECT Folder"		// row[0]
-		    " FROM asg_assignments"
-		   " WHERE CrsCod=%ld"
-		     " AND Hidden='N'"
-		     " AND Folder<>''"
-		     " AND ("
-			   "AsgCod NOT IN"
-			   " (SELECT AsgCod"
-			      " FROM asg_groups)"
-			   " OR "
-			   "AsgCod IN"
-			   " (SELECT asg_groups.AsgCod"
-			      " FROM grp_users,"
-				    "asg_groups"
-			     " WHERE grp_users.UsrCod=%ld"
-			       " AND asg_groups.GrpCod=grp_users.GrpCod)"
-			  ")",
-		   Gbl.Hierarchy.Crs.CrsCod,
-		   ZoneUsrCod);
+   DB_QueryDELETE ("can not remove old paths from clipboard",
+		   "DELETE LOW_PRIORITY FROM brw_clipboards"
+		   " WHERE CopyTime<FROM_UNIXTIME(UNIX_TIMESTAMP()-%lu)",
+                   Cfg_TIME_TO_DELETE_BROWSER_CLIPBOARD);
+  }
+
+/*****************************************************************************/
+/********* Remove clipboards with paths from a course or from a user *********/
+/*****************************************************************************/
+
+void Brw_DB_RemoveAffectedClipboards (Brw_FileBrowser_t FileBrowser,
+                                      long MyUsrCod,long WorksUsrCod)
+  {
+   switch (FileBrowser)
+     {
+      case Brw_ADMI_DOC_INS:
+      case Brw_ADMI_SHR_INS:
+         DB_QueryDELETE ("can not remove source of copy",
+			 "DELETE FROM brw_clipboards"
+			 " WHERE FileBrowser=%u"
+			   " AND Cod=%ld",
+			 (unsigned) FileBrowser,
+			 Gbl.Hierarchy.Ins.InsCod);
+         break;
+      case Brw_ADMI_DOC_CTR:
+      case Brw_ADMI_SHR_CTR:
+         DB_QueryDELETE ("can not remove source of copy",
+			 "DELETE FROM brw_clipboards"
+			 " WHERE FileBrowser=%u"
+			   " AND Cod=%ld",
+                         (unsigned) FileBrowser,
+                         Gbl.Hierarchy.Ctr.CtrCod);
+         break;
+      case Brw_ADMI_DOC_DEG:
+      case Brw_ADMI_SHR_DEG:
+         DB_QueryDELETE ("can not remove source of copy",
+			 "DELETE FROM brw_clipboards"
+			 " WHERE FileBrowser=%u"
+			   " AND Cod=%ld",
+                         (unsigned) FileBrowser,
+                         Gbl.Hierarchy.Deg.DegCod);
+         break;
+      case Brw_ADMI_DOC_CRS:
+      case Brw_ADMI_TCH_CRS:
+      case Brw_ADMI_SHR_CRS:
+      case Brw_ADMI_MRK_CRS:
+         DB_QueryDELETE ("can not remove source of copy",
+			 "DELETE FROM brw_clipboards"
+			 " WHERE FileBrowser=%u"
+			   " AND Cod=%ld",
+                         (unsigned) FileBrowser,
+                         Gbl.Hierarchy.Crs.CrsCod);
+         break;
+      case Brw_ADMI_DOC_GRP:
+      case Brw_ADMI_TCH_GRP:
+      case Brw_ADMI_SHR_GRP:
+      case Brw_ADMI_MRK_GRP:
+         DB_QueryDELETE ("can not remove source of copy",
+			 "DELETE FROM brw_clipboards"
+			 " WHERE FileBrowser=%u"
+			   " AND Cod=%ld",
+                         (unsigned) FileBrowser,
+                         Gbl.Crs.Grps.GrpCod);
+         break;
+      case Brw_ADMI_ASG_USR:
+      case Brw_ADMI_WRK_USR:
+         DB_QueryDELETE ("can not remove source of copy",
+			 "DELETE FROM brw_clipboards"
+			 " WHERE UsrCod=%ld"
+			   " AND FileBrowser=%u"
+			   " AND Cod=%ld",
+                         MyUsrCod,(unsigned) FileBrowser,
+                         Gbl.Hierarchy.Crs.CrsCod);
+         break;
+      case Brw_ADMI_ASG_CRS:
+      case Brw_ADMI_WRK_CRS:
+         DB_QueryDELETE ("can not remove source of copy",
+			 "DELETE FROM brw_clipboards"
+			 " WHERE FileBrowser=%u"
+			   " AND Cod=%ld"
+			   " AND WorksUsrCod=%ld",
+                         (unsigned) FileBrowser,
+                         Gbl.Hierarchy.Crs.CrsCod,WorksUsrCod);
+         break;
+      case Brw_ADMI_DOC_PRJ:
+      case Brw_ADMI_ASS_PRJ:
+         DB_QueryDELETE ("can not remove source of copy",
+			 "DELETE FROM brw_clipboards"
+			 " WHERE FileBrowser=%u"
+			   " AND Cod=%ld",
+                         (unsigned) FileBrowser,
+                         Prj_GetPrjCod ());
+	 break;
+      case Brw_ADMI_BRF_USR:
+         DB_QueryDELETE ("can not remove source of copy",
+			 "DELETE FROM brw_clipboards"
+			 " WHERE UsrCod=%ld"
+			   " AND FileBrowser=%u",
+                         MyUsrCod,(unsigned) FileBrowser);
+         break;
+      default:
+         break;
+     }
+  }
+
+/*****************************************************************************/
+/*********************** Store size of a file zone ***************************/
+/*****************************************************************************/
+
+void Brw_DB_StoreSizeOfFileZone (void)
+  {
+   extern const Brw_FileBrowser_t Brw_FileBrowserForDB_files[Brw_NUM_TYPES_FILE_BROWSER];
+   long Cod = Brw_GetCodForFileBrowser ();
+   long ZoneUsrCod = Brw_GetZoneUsrCodForFileBrowser ();
+
+   /***** Update size of the file browser in database *****/
+   DB_QueryREPLACE ("can not store the size of a file zone",
+		    "REPLACE INTO brw_sizes"
+		    " (FileBrowser,Cod,ZoneUsrCod,"
+		      "NumLevels,NumFolders,NumFiles,TotalSize)"
+		    " VALUES"
+		    " (%u,%ld,%ld,"
+		      "%u,'%lu','%lu','%llu')",
+	            (unsigned) Brw_FileBrowserForDB_files[Gbl.FileBrowser.Type],
+		    Cod,ZoneUsrCod,
+	            Gbl.FileBrowser.Size.NumLevls,
+	            Gbl.FileBrowser.Size.NumFolds,
+	            Gbl.FileBrowser.Size.NumFiles,
+	            Gbl.FileBrowser.Size.TotalSiz);
   }
 
 /*****************************************************************************/
@@ -1292,821 +2653,3 @@ unsigned Brw_DB_GetNumberOfOERs (MYSQL_RES **mysql_res,Brw_License_t License)
 	 return 0;	// Not reached
      }
   }
-
-
-/*****************************************************************************/
-/******** Remove files related to an institution from the database ***********/
-/*****************************************************************************/
-
-void Brw_DB_RemoveInsFiles (long InsCod)
-  {
-   /***** Remove from database the entries that store the file views *****/
-   DB_QueryDELETE ("can not remove file views to files of an institution",
-		   "DELETE FROM brw_views"
-		   " USING brw_files,"
-		          "brw_views"
-		   " WHERE brw_files.FileBrowser IN (%u,%u)"
-		     " AND brw_files.Cod=%ld"
-		     " AND brw_files.FilCod=brw_views.FilCod",
-	           (unsigned) Brw_ADMI_DOC_INS,
-	           (unsigned) Brw_ADMI_SHR_INS,
-	           InsCod);
-
-   /***** Remove from database expanded folders *****/
-   DB_QueryDELETE ("can not remove expanded folders of an institution",
-		   "DELETE LOW_PRIORITY FROM brw_expanded"
-		   " WHERE FileBrowser IN (%u,%u)"
-		     " AND Cod=%ld",
-	           (unsigned) Brw_ADMI_DOC_INS,
-	           (unsigned) Brw_ADMI_SHR_INS,
-	           InsCod);
-
-   /***** Remove from database the entries that store clipboards *****/
-   DB_QueryDELETE ("can not remove clipboards"
-		   " related to files of an institution",
-		   "DELETE FROM brw_clipboards"
-		   " WHERE FileBrowser IN (%u,%u)"
-		     " AND Cod=%ld",
-	           (unsigned) Brw_ADMI_DOC_INS,
-	           (unsigned) Brw_ADMI_SHR_INS,
-	           InsCod);
-
-   /***** Remove from database the entries that store
-          the last time users visited file zones *****/
-   DB_QueryDELETE ("can not remove file last visits"
-		   " to files of an institution",
-		   "DELETE FROM brw_last"
-		   " WHERE FileBrowser IN (%u,%u)"
-		     " AND Cod=%ld",
-	           (unsigned) Brw_ADMI_DOC_INS,
-	           (unsigned) Brw_ADMI_SHR_INS,
-	           InsCod);
-
-   /***** Remove from database the entries that store
-          the sizes of the file zones *****/
-   DB_QueryDELETE ("can not remove sizes of file zones of an institution",
-		   "DELETE FROM brw_sizes"
-		   " WHERE FileBrowser IN (%u,%u)"
-		     " AND Cod=%ld",
-	           (unsigned) Brw_ADMI_DOC_INS,
-	           (unsigned) Brw_ADMI_SHR_INS,
-	           InsCod);
-
-   /***** Remove from database the entries that store the data files *****/
-   DB_QueryDELETE ("can not remove files of an institution",
-		   "DELETE FROM brw_files"
-		   " WHERE FileBrowser IN (%u,%u)"
-		     " AND Cod=%ld",
-	           (unsigned) Brw_ADMI_DOC_INS,
-	           (unsigned) Brw_ADMI_SHR_INS,
-	           InsCod);
-  }
-
-/*****************************************************************************/
-/************ Remove files related to a center from the database *************/
-/*****************************************************************************/
-
-void Brw_DB_RemoveCtrFiles (long CtrCod)
-  {
-   /***** Remove from database the entries that store the file views *****/
-   DB_QueryDELETE ("can not remove file views to files of a center",
-		   "DELETE FROM brw_views"
-		   " USING brw_files,"
-		          "brw_views"
-		   " WHERE brw_files.FileBrowser IN (%u,%u)"
-		     " AND brw_files.Cod=%ld"
-		     " AND brw_files.FilCod=brw_views.FilCod",
-	           (unsigned) Brw_ADMI_DOC_CTR,
-	           (unsigned) Brw_ADMI_SHR_CTR,
-	           CtrCod);
-
-   /***** Remove from database expanded folders *****/
-   DB_QueryDELETE ("can not remove expanded folders of a center",
-		   "DELETE LOW_PRIORITY FROM brw_expanded"
-		   " WHERE FileBrowser IN (%u,%u)"
-		     " AND Cod=%ld",
-	           (unsigned) Brw_ADMI_DOC_CTR,
-	           (unsigned) Brw_ADMI_SHR_CTR,
-	           CtrCod);
-
-   /***** Remove from database the entries that store clipboards *****/
-   DB_QueryDELETE ("can not remove clipboards related to files of a center",
-		   "DELETE FROM brw_clipboards"
-		   " WHERE FileBrowser IN (%u,%u)"
-		     " AND Cod=%ld",
-	           (unsigned) Brw_ADMI_DOC_CTR,
-	           (unsigned) Brw_ADMI_SHR_CTR,
-	           CtrCod);
-
-   /***** Remove from database the entries that store the last time users visited file zones *****/
-   DB_QueryDELETE ("can not remove file last visits to files of a center",
-		   "DELETE FROM brw_last"
-		   " WHERE FileBrowser IN (%u,%u)"
-		     " AND Cod=%ld",
-	           (unsigned) Brw_ADMI_DOC_CTR,
-	           (unsigned) Brw_ADMI_SHR_CTR,
-	           CtrCod);
-
-   /***** Remove from database the entries that store the sizes of the file zones *****/
-   DB_QueryDELETE ("can not remove sizes of file zones of a center",
-		   "DELETE FROM brw_sizes"
-		   " WHERE FileBrowser IN (%u,%u)"
-		     " AND Cod=%ld",
-	           (unsigned) Brw_ADMI_DOC_CTR,
-	           (unsigned) Brw_ADMI_SHR_CTR,
-	           CtrCod);
-
-   /***** Remove from database the entries that store the data files *****/
-   DB_QueryDELETE ("can not remove files of a center",
-		   "DELETE FROM brw_files"
-		   " WHERE FileBrowser IN (%u,%u)"
-		     " AND Cod=%ld",
-	           (unsigned) Brw_ADMI_DOC_CTR,
-	           (unsigned) Brw_ADMI_SHR_CTR,
-	           CtrCod);
-  }
-
-/*****************************************************************************/
-/************ Remove files related to a degree from the database *************/
-/*****************************************************************************/
-
-void Brw_DB_RemoveDegFiles (long DegCod)
-  {
-   /***** Remove from database the entries that store the file views *****/
-   DB_QueryDELETE ("can not remove file views to files of a degree",
-		   "DELETE FROM brw_views"
-		   " USING brw_files,"
-		          "brw_views"
-		   " WHERE brw_files.FileBrowser IN (%u,%u)"
-		     " AND brw_files.Cod=%ld"
-		     " AND brw_files.FilCod=brw_views.FilCod",
-	           (unsigned) Brw_ADMI_DOC_DEG,
-	           (unsigned) Brw_ADMI_SHR_DEG,
-	           DegCod);
-
-   /***** Remove from database expanded folders *****/
-   DB_QueryDELETE ("can not remove expanded folders of a degree",
-		   "DELETE LOW_PRIORITY FROM brw_expanded"
-		   " WHERE FileBrowser IN (%u,%u)"
-		     " AND Cod=%ld",
-	           (unsigned) Brw_ADMI_DOC_DEG,
-	           (unsigned) Brw_ADMI_SHR_DEG,
-	           DegCod);
-
-   /***** Remove from database the entries that store clipboards *****/
-   DB_QueryDELETE ("can not remove clipboards related to files of a degree",
-		   "DELETE FROM brw_clipboards"
-		   " WHERE FileBrowser IN (%u,%u)"
-		     " AND Cod=%ld",
-	           (unsigned) Brw_ADMI_DOC_DEG,
-	           (unsigned) Brw_ADMI_SHR_DEG,
-	           DegCod);
-
-   /***** Remove from database the entries that store the last time users visited file zones *****/
-   DB_QueryDELETE ("can not remove file last visits to files of a degree",
-		   "DELETE FROM brw_last"
-		   " WHERE FileBrowser IN (%u,%u)"
-		     " AND Cod=%ld",
-	           (unsigned) Brw_ADMI_DOC_DEG,
-	           (unsigned) Brw_ADMI_SHR_DEG,
-	           DegCod);
-
-   /***** Remove from database the entries that store the sizes of the file zones *****/
-   DB_QueryDELETE ("can not remove sizes of file zones of a degree",
-		   "DELETE FROM brw_sizes"
-		   " WHERE FileBrowser IN (%u,%u)"
-		     " AND Cod=%ld",
-	           (unsigned) Brw_ADMI_DOC_DEG,
-	           (unsigned) Brw_ADMI_SHR_DEG,
-	           DegCod);
-
-   /***** Remove from database the entries that store the data files *****/
-   DB_QueryDELETE ("can not remove files of a degree",
-		   "DELETE FROM brw_files"
-		   " WHERE FileBrowser IN (%u,%u)"
-		     " AND Cod=%ld",
-	           (unsigned) Brw_ADMI_DOC_DEG,
-	           (unsigned) Brw_ADMI_SHR_DEG,
-	           DegCod);
-  }
-
-/*****************************************************************************/
-/************ Remove files related to a course from the database *************/
-/*****************************************************************************/
-/* Remove information related to files in course,
-   including groups and projects,
-   so this function must be called
-   before removing groups and projects */
-
-void Brw_DB_RemoveCrsFiles (long CrsCod)
-  {
-   char SubqueryGrp[256];
-   char SubqueryPrj[128];
-
-   /***** Build subquery for groups *****/
-   sprintf (SubqueryGrp,"(SELECT grp_groups.GrpCod"
-	                  " FROM grp_types,"
-	                        "grp_groups"
-		         " WHERE grp_types.CrsCod=%ld"
-		           " AND grp_types.GrpTypCod=grp_groups.GrpTypCod)",
-            CrsCod);
-
-   /***** Build subquery for projects *****/
-   sprintf (SubqueryPrj,"(SELECT PrjCod"
-	                  " FROM prj_projects"
-	                 " WHERE CrsCod=%ld)",
-            CrsCod);
-
-   /***** Remove format of files of marks *****/
-   DB_QueryDELETE ("can not remove the properties of marks"
-		   " associated to a course",
-		   "DELETE FROM mrk_marks"
-		   " USING brw_files,"
-		          "mrk_marks"
-		   " WHERE brw_files.FileBrowser=%u"
-		     " AND brw_files.Cod=%ld"
-		     " AND brw_files.FilCod=mrk_marks.FilCod",
-	           (unsigned) Brw_ADMI_MRK_CRS,
-	           CrsCod);
-
-   /***** Remove from database the entries that store the file views *****/
-   /* Remove from course file zones */
-   DB_QueryDELETE ("can not remove file views to files of a course",
-		   "DELETE FROM brw_views"
-		   " USING brw_files,"
-		          "brw_views"
-		   " WHERE brw_files.FileBrowser IN (%u,%u,%u,%u,%u,%u)"
-		     " AND brw_files.Cod=%ld"
-		     " AND brw_files.FilCod=brw_views.FilCod",
-	           (unsigned) Brw_ADMI_DOC_CRS,
-	           (unsigned) Brw_ADMI_TCH_CRS,
-	           (unsigned) Brw_ADMI_SHR_CRS,
-	           (unsigned) Brw_ADMI_ASG_USR,
-	           (unsigned) Brw_ADMI_WRK_USR,
-	           (unsigned) Brw_ADMI_MRK_CRS,
-	           CrsCod);
-
-   /* Remove from group file zones */
-   DB_QueryDELETE ("can not remove file views to files of a course",
-		   "DELETE FROM brw_views"
-		   " USING brw_files,"
-		          "brw_views"
-		   " WHERE brw_files.FileBrowser IN (%u,%u,%u,%u)"
-		     " AND brw_files.Cod IN %s"
-		     " AND brw_files.FilCod=brw_views.FilCod",
-	           (unsigned) Brw_ADMI_DOC_GRP,
-	           (unsigned) Brw_ADMI_TCH_GRP,
-	           (unsigned) Brw_ADMI_SHR_GRP,
-	           (unsigned) Brw_ADMI_MRK_GRP,
-	           SubqueryGrp);
-
-   /* Remove from project file zones */
-   DB_QueryDELETE ("can not remove file views to files of a course",
-		   "DELETE FROM brw_views"
-		   " USING brw_files,"
-		          "brw_views"
-		   " WHERE brw_files.FileBrowser IN (%u,%u)"
-		     " AND brw_files.Cod IN %s"
-		     " AND brw_files.FilCod=brw_views.FilCod",
-	           (unsigned) Brw_ADMI_DOC_PRJ,
-	           (unsigned) Brw_ADMI_ASS_PRJ,
-	           SubqueryPrj);
-
-   /***** Remove from database expanded folders *****/
-   /* Remove from course file zones */
-   DB_QueryDELETE ("can not remove expanded folders of a course",
-		   "DELETE LOW_PRIORITY FROM brw_expanded"
-		   " WHERE FileBrowser IN (%u,%u,%u,%u,%u,%u,%u,%u)"
-		     " AND Cod=%ld",
-	           (unsigned) Brw_ADMI_DOC_CRS,
-	           (unsigned) Brw_ADMI_TCH_CRS,
-	           (unsigned) Brw_ADMI_SHR_CRS,
-	           (unsigned) Brw_ADMI_ASG_USR,
-	           (unsigned) Brw_ADMI_ASG_CRS,
-	           (unsigned) Brw_ADMI_WRK_USR,
-	           (unsigned) Brw_ADMI_WRK_CRS,
-	           (unsigned) Brw_ADMI_MRK_CRS,
-	           CrsCod);
-
-   /* Remove from group file zones */
-   DB_QueryDELETE ("can not remove expanded folders of a course",
-		   "DELETE LOW_PRIORITY FROM brw_expanded"
-		   " WHERE FileBrowser IN (%u,%u,%u,%u)"
-		     " AND Cod IN %s",
-	           (unsigned) Brw_ADMI_DOC_GRP,
-	           (unsigned) Brw_ADMI_TCH_GRP,
-	           (unsigned) Brw_ADMI_SHR_GRP,
-	           (unsigned) Brw_ADMI_MRK_GRP,
-	           SubqueryGrp);
-
-   /* Remove from project file zones */
-   DB_QueryDELETE ("can not remove expanded folders of a course",
-		   "DELETE LOW_PRIORITY FROM brw_expanded"
-		   " WHERE FileBrowser IN (%u,%u)"
-		     " AND Cod IN %s",
-	           (unsigned) Brw_ADMI_DOC_PRJ,
-	           (unsigned) Brw_ADMI_ASS_PRJ,
-	           SubqueryPrj);
-
-   /***** Remove from database the entries that store clipboards *****/
-   /* Remove from course file zones */
-   DB_QueryDELETE ("can not remove clipboards related to files of a course",
-		   "DELETE FROM brw_clipboards"
-		   " WHERE FileBrowser IN (%u,%u,%u,%u,%u,%u,%u,%u)"
-		     " AND Cod=%ld",
-	           (unsigned) Brw_ADMI_DOC_CRS,
-	           (unsigned) Brw_ADMI_TCH_CRS,
-	           (unsigned) Brw_ADMI_SHR_CRS,
-	           (unsigned) Brw_ADMI_ASG_USR,
-	           (unsigned) Brw_ADMI_ASG_CRS,
-	           (unsigned) Brw_ADMI_WRK_USR,
-	           (unsigned) Brw_ADMI_WRK_CRS,
-	           (unsigned) Brw_ADMI_MRK_CRS,
-	           CrsCod);
-
-   /* Remove from group file zones */
-   DB_QueryDELETE ("can not remove clipboards related to files of a course",
-		   "DELETE FROM brw_clipboards"
-		   " WHERE FileBrowser IN (%u,%u,%u,%u)"
-		     " AND Cod IN %s",
-	           (unsigned) Brw_ADMI_DOC_GRP,
-	           (unsigned) Brw_ADMI_TCH_GRP,
-	           (unsigned) Brw_ADMI_SHR_GRP,
-	           (unsigned) Brw_ADMI_MRK_GRP,
-	           SubqueryGrp);
-
-   /* Remove from project file zones */
-   DB_QueryDELETE ("can not remove clipboards related to files of a course",
-		   "DELETE FROM brw_clipboards"
-		   " WHERE FileBrowser IN (%u,%u)"
-		     " AND Cod IN %s",
-	           (unsigned) Brw_ADMI_DOC_PRJ,
-	           (unsigned) Brw_ADMI_ASS_PRJ,
-	           SubqueryPrj);
-
-   /***** Remove from database the entries that store the last time users visited file zones *****/
-   // Assignments and works are stored as one in brw_last...
-   // ...because a user views them at the same time
-   /* Remove from course file zones */
-   DB_QueryDELETE ("can not remove file last visits to files of a course",
-		   "DELETE FROM brw_last"
-		   " WHERE FileBrowser IN (%u,%u,%u,%u,%u)"
-		     " AND Cod=%ld",
-	           (unsigned) Brw_ADMI_DOC_CRS,
-	           (unsigned) Brw_ADMI_TCH_CRS,
-	           (unsigned) Brw_ADMI_SHR_CRS,
-	           (unsigned) Brw_ADMI_ASG_USR,
-	           (unsigned) Brw_ADMI_MRK_CRS,
-	           CrsCod);
-
-   /* Remove from group file zones */
-    DB_QueryDELETE ("can not remove file last visits to files of a course",
-		    "DELETE FROM brw_last"
-		   " WHERE FileBrowser IN (%u,%u,%u,%u)"
-		     " AND Cod IN %s",
-	           (unsigned) Brw_ADMI_DOC_GRP,
-	           (unsigned) Brw_ADMI_TCH_GRP,
-	           (unsigned) Brw_ADMI_SHR_GRP,
-	           (unsigned) Brw_ADMI_MRK_GRP,
-	           SubqueryGrp);
-
-   /* Remove from project file zones */
-   DB_QueryDELETE ("can not remove file last visits to files of a course",
-		   "DELETE FROM brw_last"
-		   " WHERE FileBrowser IN (%u,%u)"
-		     " AND Cod IN %s",
-	           (unsigned) Brw_ADMI_DOC_PRJ,
-	           (unsigned) Brw_ADMI_ASS_PRJ,
-	           SubqueryPrj);
-
-   /***** Remove from database the entries that store the sizes of the file zones *****/
-   /* Remove from course file zones */
-   DB_QueryDELETE ("can not remove sizes of file zones of a course",
-		   "DELETE FROM brw_sizes"
-		   " WHERE FileBrowser IN (%u,%u,%u,%u,%u,%u)"
-		     " AND Cod=%ld",
-	           (unsigned) Brw_ADMI_DOC_CRS,
-	           (unsigned) Brw_ADMI_TCH_CRS,
-	           (unsigned) Brw_ADMI_SHR_CRS,
-	           (unsigned) Brw_ADMI_ASG_USR,
-	           (unsigned) Brw_ADMI_WRK_USR,
-	           (unsigned) Brw_ADMI_MRK_CRS,
-	           CrsCod);
-
-   /* Remove from group file zones */
-   DB_QueryDELETE ("can not remove sizes of file zones of a course",
-		   "DELETE FROM brw_sizes"
-		   " WHERE FileBrowser IN (%u,%u,%u,%u)"
-		     " AND Cod IN %s",
-	           (unsigned) Brw_ADMI_DOC_GRP,
-	           (unsigned) Brw_ADMI_TCH_GRP,
-	           (unsigned) Brw_ADMI_SHR_GRP,
-	           (unsigned) Brw_ADMI_MRK_GRP,
-	           SubqueryGrp);
-
-   /* Remove from project file zones */
-   DB_QueryDELETE ("can not remove sizes of file zones of a course",
-		   "DELETE FROM brw_sizes"
-		   " WHERE FileBrowser IN (%u,%u)"
-		     " AND Cod IN %s",
-	           (unsigned) Brw_ADMI_DOC_PRJ,
-	           (unsigned) Brw_ADMI_ASS_PRJ,
-	           SubqueryPrj);
-
-   /***** Remove from database the entries that store the data files *****/
-   /* Remove from course file zones */
-   DB_QueryDELETE ("can not remove files of a course",
-		   "DELETE FROM brw_files"
-		   " WHERE FileBrowser IN (%u,%u,%u,%u,%u,%u)"
-		     " AND Cod=%ld",
-	           (unsigned) Brw_ADMI_DOC_CRS,
-	           (unsigned) Brw_ADMI_TCH_CRS,
-	           (unsigned) Brw_ADMI_SHR_CRS,
-	           (unsigned) Brw_ADMI_ASG_USR,
-	           (unsigned) Brw_ADMI_WRK_USR,
-	           (unsigned) Brw_ADMI_MRK_CRS,
-	           CrsCod);
-
-   /* Remove from group file zones */
-   DB_QueryDELETE ("can not remove files of a course",
-		   "DELETE FROM brw_files"
-		   " WHERE FileBrowser IN (%u,%u,%u,%u)"
-		     " AND Cod IN %s",
-	           (unsigned) Brw_ADMI_DOC_GRP,
-	           (unsigned) Brw_ADMI_TCH_GRP,
-	           (unsigned) Brw_ADMI_SHR_GRP,
-	           (unsigned) Brw_ADMI_MRK_GRP,
-	           SubqueryGrp);
-
-   /* Remove from project file zones */
-   DB_QueryDELETE ("can not remove files of a course",
-		   "DELETE FROM brw_files"
-		   " WHERE FileBrowser IN (%u,%u)"
-		     " AND Cod IN %s",
-	           (unsigned) Brw_ADMI_DOC_PRJ,
-	           (unsigned) Brw_ADMI_ASS_PRJ,
-	           SubqueryPrj);
-  }
-
-/*****************************************************************************/
-/************ Remove files related to a group from the database **************/
-/*****************************************************************************/
-
-void Brw_DB_RemoveGrpFiles (long GrpCod)
-  {
-   /***** Remove format of files of marks *****/
-   DB_QueryDELETE ("can not remove the properties of marks"
-		   " associated to a group",
-		   "DELETE FROM mrk_marks"
-		   " USING brw_files,"
-		          "mrk_marks"
-		   " WHERE brw_files.FileBrowser=%u"
-		     " AND brw_files.Cod=%ld"
-		     " AND brw_files.FilCod=mrk_marks.FilCod",
-	           (unsigned) Brw_ADMI_MRK_GRP,
-	           GrpCod);
-
-   /***** Remove from database the entries that store the file views *****/
-   DB_QueryDELETE ("can not remove file views to files of a group",
-		   "DELETE FROM brw_views"
-		   " USING brw_files,"
-		          "brw_views"
-		   " WHERE brw_files.FileBrowser IN (%u,%u,%u,%u)"
-		     " AND brw_files.Cod=%ld"
-		     " AND brw_files.FilCod=brw_views.FilCod",
-	           (unsigned) Brw_ADMI_DOC_GRP,
-	           (unsigned) Brw_ADMI_TCH_GRP,
-	           (unsigned) Brw_ADMI_SHR_GRP,
-	           (unsigned) Brw_ADMI_MRK_GRP,
-	           GrpCod);
-
-   /***** Remove from database expanded folders *****/
-   DB_QueryDELETE ("can not remove expanded folders of a group",
-		   "DELETE LOW_PRIORITY FROM brw_expanded"
-		   " WHERE FileBrowser IN (%u,%u,%u,%u)"
-		   " AND Cod=%ld",
-	           (unsigned) Brw_ADMI_DOC_GRP,
-	           (unsigned) Brw_ADMI_TCH_GRP,
-	           (unsigned) Brw_ADMI_SHR_GRP,
-	           (unsigned) Brw_ADMI_MRK_GRP,
-	           GrpCod);
-
-   /***** Remove from database the entries that store clipboards *****/
-   DB_QueryDELETE ("can not remove clipboards related to files of a group",
-		   "DELETE FROM brw_clipboards"
-		   " WHERE FileBrowser IN (%u,%u,%u,%u)"
-		     " AND Cod=%ld",
-	           (unsigned) Brw_ADMI_DOC_GRP,
-	           (unsigned) Brw_ADMI_TCH_GRP,
-	           (unsigned) Brw_ADMI_SHR_GRP,
-	           (unsigned) Brw_ADMI_MRK_GRP,
-	           GrpCod);
-
-   /***** Remove from database the entries that store the last time users visited file zones *****/
-   DB_QueryDELETE ("can not remove file last visits to files of a group",
-		   "DELETE FROM brw_last"
-		   " WHERE FileBrowser IN (%u,%u,%u,%u)"
-		   " AND Cod=%ld",
-	           (unsigned) Brw_ADMI_DOC_GRP,
-	           (unsigned) Brw_ADMI_TCH_GRP,
-	           (unsigned) Brw_ADMI_SHR_GRP,
-	           (unsigned) Brw_ADMI_MRK_GRP,
-	           GrpCod);
-
-   /***** Remove from database the entries that store the sizes of the file zones *****/
-   DB_QueryDELETE ("can not remove sizes of file zones of a group",
-		   "DELETE FROM brw_sizes"
-		   " WHERE FileBrowser IN (%u,%u,%u,%u)"
-		   " AND Cod=%ld",
-	           (unsigned) Brw_ADMI_DOC_GRP,
-	           (unsigned) Brw_ADMI_TCH_GRP,
-	           (unsigned) Brw_ADMI_SHR_GRP,
-	           (unsigned) Brw_ADMI_MRK_GRP,
-	           GrpCod);
-
-   /***** Remove from database the entries that store the data files *****/
-   DB_QueryDELETE ("can not remove files of a group",
-		   "DELETE FROM brw_files"
-		   " WHERE FileBrowser IN (%u,%u,%u,%u)"
-		     " AND Cod=%ld",
-	           (unsigned) Brw_ADMI_DOC_GRP,
-	           (unsigned) Brw_ADMI_TCH_GRP,
-	           (unsigned) Brw_ADMI_SHR_GRP,
-	           (unsigned) Brw_ADMI_MRK_GRP,
-	           GrpCod);
-  }
-
-/*****************************************************************************/
-/*********** Remove files related to a project from the database *************/
-/*****************************************************************************/
-
-void Brw_DB_RemovePrjFiles (long PrjCod)
-  {
-   /***** Remove from database the entries that store the file views *****/
-   DB_QueryDELETE ("can not remove file views to files of a project",
-		   "DELETE FROM brw_views"
-		   " USING brw_files,"
-		          "brw_views"
-		   " WHERE brw_files.FileBrowser IN (%u,%u)"
-		     " AND brw_files.Cod=%ld"
-		     " AND brw_files.FilCod=brw_views.FilCod",
-	           (unsigned) Brw_ADMI_DOC_PRJ,
-	           (unsigned) Brw_ADMI_ASS_PRJ,
-	           PrjCod);
-
-   /***** Remove from database expanded folders *****/
-   DB_QueryDELETE ("can not remove expanded folders of a project",
-		   "DELETE LOW_PRIORITY FROM brw_expanded"
-		   " WHERE FileBrowser IN (%u,%u)"
-		     " AND Cod=%ld",
-	           (unsigned) Brw_ADMI_DOC_PRJ,
-	           (unsigned) Brw_ADMI_ASS_PRJ,
-	           PrjCod);
-
-   /***** Remove from database the entries that store clipboards *****/
-   DB_QueryDELETE ("can not remove clipboards related to files of a project",
-		   "DELETE FROM brw_clipboards"
-		   " WHERE FileBrowser IN (%u,%u)"
-		     " AND Cod=%ld",
-	           (unsigned) Brw_ADMI_DOC_PRJ,
-	           (unsigned) Brw_ADMI_ASS_PRJ,
-	           PrjCod);
-
-   /***** Remove from database the entries that store the last time users visited file zones *****/
-   DB_QueryDELETE ("can not remove file last visits to files of a project",
-		   "DELETE FROM brw_last"
-		   " WHERE FileBrowser IN (%u,%u)"
-		     " AND Cod=%ld",
-	           (unsigned) Brw_ADMI_DOC_PRJ,
-	           (unsigned) Brw_ADMI_ASS_PRJ,
-	           PrjCod);
-
-   /***** Remove from database the entries that store the sizes of the file zones *****/
-   DB_QueryDELETE ("can not remove sizes of file zones of a project",
-		   "DELETE FROM brw_sizes"
-		   " WHERE FileBrowser IN (%u,%u)"
-		     " AND Cod=%ld",
-	           (unsigned) Brw_ADMI_DOC_PRJ,
-	           (unsigned) Brw_ADMI_ASS_PRJ,
-	           PrjCod);
-
-   /***** Remove from database the entries that store the data files *****/
-   DB_QueryDELETE ("can not remove files of a project",
-		   "DELETE FROM brw_files"
-		   " WHERE FileBrowser IN (%u,%u)"
-		     " AND Cod=%ld",
-	           (unsigned) Brw_ADMI_DOC_PRJ,
-	           (unsigned) Brw_ADMI_ASS_PRJ,
-	           PrjCod);
-  }
-
-/*****************************************************************************/
-/* Remove some info about files related to a course and a user from database */
-/*****************************************************************************/
-
-void Brw_DB_RemoveSomeInfoAboutCrsUsrFiles (long UsrCod,long CrsCod)
-  {
-   /***** Remove from database expanded folders *****/
-   DB_QueryDELETE ("can not remove expanded folders for a user in a course",
-		   "DELETE LOW_PRIORITY FROM brw_expanded"
-		   " WHERE UsrCod=%ld"
-		     " AND ("
-			    "(FileBrowser IN (%u,%u,%u,%u,%u,%u,%u,%u)"
-			    " AND Cod=%ld)"
-			    " OR "
-			    "(FileBrowser IN (%u,%u,%u,%u)"
-			    " AND Cod IN"
-			    " (SELECT grp_groups.GrpCod"
-			       " FROM grp_types,"
-			             "grp_groups"
-			      " WHERE grp_types.CrsCod=%ld"
-			        " AND grp_types.GrpTypCod=grp_groups.GrpTypCod))"
-		          ")",
-	           UsrCod,
-	           (unsigned) Brw_ADMI_DOC_CRS,
-	           (unsigned) Brw_ADMI_TCH_CRS,
-	           (unsigned) Brw_ADMI_SHR_CRS,
-	           (unsigned) Brw_ADMI_ASG_USR,
-	           (unsigned) Brw_ADMI_ASG_CRS,
-	           (unsigned) Brw_ADMI_WRK_USR,
-	           (unsigned) Brw_ADMI_WRK_CRS,
-	           (unsigned) Brw_ADMI_MRK_CRS,
-	           CrsCod,
-	           (unsigned) Brw_ADMI_DOC_GRP,
-	           (unsigned) Brw_ADMI_TCH_GRP,
-	           (unsigned) Brw_ADMI_SHR_GRP,
-	           (unsigned) Brw_ADMI_MRK_GRP,
-	           CrsCod);
-
-   /***** Remove from database the entries that store clipboards *****/
-   DB_QueryDELETE ("can not remove source of copy for a user in a course",
-		   "DELETE FROM brw_clipboards"
-		   " WHERE UsrCod=%ld"
-		     " AND ("
-			    "(FileBrowser IN (%u,%u,%u,%u,%u,%u,%u,%u)"
-			    " AND Cod=%ld)"
-			    " OR "
-			    "(FileBrowser IN (%u,%u,%u,%u)"
-			    " AND Cod IN"
-			    " (SELECT grp_groups.GrpCod"
-			       " FROM grp_types,"
-			             "grp_groups"
-			      " WHERE grp_types.CrsCod=%ld"
-			        " AND grp_types.GrpTypCod=grp_groups.GrpTypCod))"
-		          ")",
-	           UsrCod,
-	           (unsigned) Brw_ADMI_DOC_CRS,
-	           (unsigned) Brw_ADMI_TCH_CRS,
-	           (unsigned) Brw_ADMI_SHR_CRS,
-	           (unsigned) Brw_ADMI_ASG_USR,
-	           (unsigned) Brw_ADMI_ASG_CRS,
-	           (unsigned) Brw_ADMI_WRK_USR,
-	           (unsigned) Brw_ADMI_WRK_CRS,
-	           (unsigned) Brw_ADMI_MRK_CRS,
-	           CrsCod,
-	           (unsigned) Brw_ADMI_DOC_GRP,
-	           (unsigned) Brw_ADMI_TCH_GRP,
-	           (unsigned) Brw_ADMI_SHR_GRP,
-	           (unsigned) Brw_ADMI_MRK_GRP,
-	           CrsCod);
-
-   /***** Remove from database the entries that store the last time user visited file zones *****/
-   // Assignments and works are stored as one in brw_last...
-   // ...because a user views them at the same time
-   DB_QueryDELETE ("can not remove file last visits to files of a course"
-		   " from a user",
-		   "DELETE FROM brw_last"
-		   " WHERE UsrCod=%ld"
-		     " AND ("
-			    "(FileBrowser IN (%u,%u,%u,%u,%u)"
-			    " AND Cod=%ld)"
-			    " OR "
-			    "(FileBrowser IN (%u,%u,%u,%u)"
-			    " AND Cod IN"
-			    " (SELECT grp_groups.GrpCod"
-			       " FROM grp_types,"
-			             "grp_groups"
-			      " WHERE grp_types.CrsCod=%ld"
-			        " AND grp_types.GrpTypCod=grp_groups.GrpTypCod))"
-		          ")",
-	           UsrCod,
-	           (unsigned) Brw_ADMI_DOC_CRS,
-	           (unsigned) Brw_ADMI_TCH_CRS,
-	           (unsigned) Brw_ADMI_SHR_CRS,
-	           (unsigned) Brw_ADMI_ASG_USR,
-	           (unsigned) Brw_ADMI_MRK_CRS,
-	           CrsCod,
-	           (unsigned) Brw_ADMI_DOC_GRP,
-	           (unsigned) Brw_ADMI_TCH_GRP,
-	           (unsigned) Brw_ADMI_SHR_GRP,
-	           (unsigned) Brw_ADMI_MRK_GRP,
-	           CrsCod);
-  }
-
-/*****************************************************************************/
-/*************** Remove user's works in a course from database ***************/
-/*****************************************************************************/
-
-void Brw_DB_RemoveWrkFiles (long CrsCod,long UsrCod)
-  {
-   /***** Remove from database the entries that store the file views *****/
-   DB_QueryDELETE ("can not remove file views",
-		   "DELETE FROM brw_views"
-		   " USING brw_files,"
-		          "brw_views"
-		   " WHERE brw_files.FileBrowser IN (%u,%u)"
-		     " AND brw_files.Cod=%ld"
-		     " AND brw_files.ZoneUsrCod=%ld"
-		     " AND brw_files.FilCod=brw_views.FilCod",
-	           (unsigned) Brw_ADMI_ASG_USR,
-	           (unsigned) Brw_ADMI_WRK_USR,
-	           CrsCod,UsrCod);
-
-   /***** Remove from database expanded folders *****/
-   DB_QueryDELETE ("can not remove expanded folders of a group",
-		   "DELETE LOW_PRIORITY FROM brw_expanded"
-		   " WHERE FileBrowser IN (%u,%u)"
-		     " AND Cod=%ld"
-		     " AND WorksUsrCod=%ld",
-	           (unsigned) Brw_ADMI_ASG_CRS,
-	           (unsigned) Brw_ADMI_WRK_CRS,
-	           CrsCod,UsrCod);
-
-   /***** Remove from database the entries that store clipboards *****/
-   DB_QueryDELETE ("can not remove clipboards",
-		   "DELETE FROM brw_clipboards"
-		   " WHERE FileBrowser IN (%u,%u)"
-		     " AND Cod=%ld"
-		     " AND WorksUsrCod=%ld",
-	           (unsigned) Brw_ADMI_ASG_CRS,
-	           (unsigned) Brw_ADMI_WRK_CRS,
-	           CrsCod,UsrCod);
-
-   /***** Remove from database the entries that store the sizes of the file zones *****/
-   DB_QueryDELETE ("can not remove file browser sizes",
-		   "DELETE FROM brw_sizes"
-		   " WHERE FileBrowser IN (%u,%u)"
-		     " AND Cod=%ld"
-		     " AND ZoneUsrCod=%ld",
-	           (unsigned) Brw_ADMI_ASG_USR,
-	           (unsigned) Brw_ADMI_WRK_USR,
-	           CrsCod,UsrCod);
-
-   /***** Remove from database the entries that store the data files *****/
-   DB_QueryDELETE ("can not remove files",
-		   "DELETE FROM brw_files"
-		   " WHERE FileBrowser IN (%u,%u)"
-		     " AND Cod=%ld"
-		     " AND ZoneUsrCod=%ld",
-	           (unsigned) Brw_ADMI_ASG_USR,
-	           (unsigned) Brw_ADMI_WRK_USR,
-	           CrsCod,UsrCod);
-  }
-
-/*****************************************************************************/
-/************* Remove files related to a user from the database **************/
-/*****************************************************************************/
-
-void Brw_DB_RemoveUsrFiles (long UsrCod)
-  {
-   /***** Remove from database the entries that store the file views *****/
-   // User is not removed from brw_views table,
-   // in order to take into account his/her views
-   DB_QueryDELETE ("can not remove file views to files of a user",
-		   "DELETE FROM brw_views"
-		   " USING brw_files,"
-		          "brw_views"
-		   " WHERE brw_files.ZoneUsrCod=%ld"
-		     " AND brw_files.FilCod=brw_views.FilCod",
-	           UsrCod);
-
-   /***** Remove from database expanded folders *****/
-   DB_QueryDELETE ("can not remove expanded folders for a user",
-		   "DELETE LOW_PRIORITY FROM brw_expanded"
-		   " WHERE UsrCod=%ld",
-	           UsrCod);
-
-   /***** Remove from database the entries that store clipboards *****/
-   DB_QueryDELETE ("can not remove user's clipboards",
-		   "DELETE FROM brw_clipboards"
-		   " WHERE UsrCod=%ld",	// User's clipboard
-	           UsrCod);
-
-   /***** Remove from database the entries that store the last time users visited file zones *****/
-   DB_QueryDELETE ("can not remove user's last visits to file zones",
-		   "DELETE FROM brw_last"
-		   " WHERE UsrCod=%ld",	// User's last visits to all zones
-	           UsrCod);
-
-   /***** Remove from database the entries that store the sizes of the file zones *****/
-   DB_QueryDELETE ("can not remove sizes of user's file zones",
-		   "DELETE FROM brw_sizes"
-		   " WHERE ZoneUsrCod=%ld",
-	           UsrCod);
-
-   /***** Remove from database the entries that store the data files *****/
-   DB_QueryDELETE ("can not remove files in user's file zones",
-		   "DELETE FROM brw_files"
-		   " WHERE ZoneUsrCod=%ld",
-	           UsrCod);
-  }
diff --git a/swad_browser_database.h b/swad_browser_database.h
index 6131c19d..71f02fa4 100644
--- a/swad_browser_database.h
+++ b/swad_browser_database.h
@@ -47,23 +47,10 @@
 /***************************** Public prototypes *****************************/
 /*****************************************************************************/
 
-void Brw_DB_StoreSizeOfFileZone (void);
-
-void Brw_DB_UpdateDateMyLastAccFileBrowser (Brw_FileBrowser_t FileBrowser);
-unsigned Brw_DB_GetDateMyLastAccFileBrowser (MYSQL_RES **mysql_res,
-                                             Brw_FileBrowser_t FileBrowser);
-unsigned Brw_DB_GetGrpLastAccFileBrowser (MYSQL_RES **mysql_res,const char *FieldNameDB);
-
-void Brw_DB_AddPathToClipboards (void);
-void Brw_DB_UpdatePathInClipboard (void);
-unsigned Brw_DB_GetMyClipboard (MYSQL_RES **mysql_res);
-
+//------------------------------- Assignments ---------------------------------
 unsigned Brw_DB_GetFoldersAssignments (MYSQL_RES **mysql_res,long ZoneUsrCod);
 
-void Brw_DB_GetSizeOfFileBrowser (MYSQL_RES **mysql_res,
-			          Brw_FileBrowser_t FileBrowser);
-unsigned Brw_DB_GetNumberOfOERs (MYSQL_RES **mysql_res,Brw_License_t License);
-
+//---------------------------------- Files ------------------------------------
 void Brw_DB_RemoveInsFiles (long InsCod);
 void Brw_DB_RemoveCtrFiles (long CtrCod);
 void Brw_DB_RemoveDegFiles (long DegCod);
@@ -74,4 +61,40 @@ void Brw_DB_RemoveSomeInfoAboutCrsUsrFiles (long UsrCod,long CrsCod);
 void Brw_DB_RemoveWrkFiles (long CrsCod,long UsrCod);
 void Brw_DB_RemoveUsrFiles (long UsrCod);
 
+//--------------------- My last access to file browsers -----------------------
+void Brw_DB_UpdateDateMyLastAccFileBrowser (void);
+unsigned Brw_DB_GetDateMyLastAccFileBrowser (MYSQL_RES **mysql_res);
+unsigned Brw_DB_GetGrpLastAccFileBrowser (MYSQL_RES **mysql_res,const char *FieldNameDB);
+
+//------------------------------- Hidden files --------------------------------
+unsigned Brw_DB_CheckIfFileOrFolderIsSetAsHiddenUsingPath (MYSQL_RES **mysql_res,
+                                                           const char *Path);
+bool Brw_DB_CheckIfFileOrFolderIsSetAsHiddenUsingMetadata (const struct FileMetadata *FileMetadata);
+
+//---------------------------- Expanded folders -------------------------------
+void Brw_DB_InsertFolderInExpandedFolders (const char Path[PATH_MAX + 1]);
+void Brw_DB_UpdateClickTimeOfThisFileBrowserInExpandedFolders (void);
+bool Brw_DB_GetIfExpandedFolder (const char Path[PATH_MAX + 1]);
+void Brw_DB_RemoveFolderFromExpandedFolders (const char Path[PATH_MAX + 1]);
+void Brw_DB_RemoveAffectedExpandedFolders (const char Path[PATH_MAX + 1]);
+void Brw_DB_RenameAffectedExpandedFolders (Brw_FileBrowser_t FileBrowser,
+                                           long MyUsrCod,long WorksUsrCod,
+                                           const char *OldPath,const char *NewPath);
+
+//------------------------------- Cliboards -----------------------------------
+void Brw_DB_AddPathToClipboards (void);
+void Brw_DB_UpdatePathInClipboard (void);
+unsigned Brw_DB_GetMyClipboard (MYSQL_RES **mysql_res);
+void Brw_DB_RemoveExpiredClipboards (void);
+void Brw_DB_RemoveAffectedClipboards (Brw_FileBrowser_t FileBrowser,
+                                      long MyUsrCod,long WorksUsrCod);
+
+//-------------------------- Size of file zones -------------------------------
+void Brw_DB_StoreSizeOfFileZone (void);
+void Brw_DB_GetSizeOfFileBrowser (MYSQL_RES **mysql_res,
+			          Brw_FileBrowser_t FileBrowser);
+
+//-------------------- OERs (Open Educational Resources) ----------------------
+unsigned Brw_DB_GetNumberOfOERs (MYSQL_RES **mysql_res,Brw_License_t License);
+
 #endif
diff --git a/swad_changelog.h b/swad_changelog.h
index b302c40b..9761f275 100644
--- a/swad_changelog.h
+++ b/swad_changelog.h
@@ -602,13 +602,14 @@ TODO: FIX BUG, URGENT! En las fechas como par
 
 TODO: En las encuestas, que los estudiantes no puedan ver los resultados hasta que no finalice el plazo.
 */
-#define Log_PLATFORM_VERSION	"SWAD 21.2 (2021-09-14)"
+#define Log_PLATFORM_VERSION	"SWAD 21.2.1 (2021-09-14)"
 #define CSS_FILE		"swad20.45.css"
 #define JS_FILE			"swad20.69.1.js"
 /*
 TODO: Rename CENTRE to CENTER in help wiki.
 TODO: Rename ASSESSMENT.Announcements to ASSESSMENT.Calls_for_exams
 
+	Version 21.2.1:   Sep 14, 2021  Queries moved to module swad_browser_database. (315003 lines)
 	Version 21.2:     Sep 14, 2021  Code refactoring related to file browsers. (314983 lines)
 	Version 21.1.1:   Sep 14, 2021  Queries moved to module swad_enrolment_database. (315050 lines)
 	Version 21.1:     Sep 13, 2021  New module swad_browser_database for database queries related to file browsers. (315050 lines)