diff --git a/sql/cambios.sql b/sql/cambios.sql
index 6e01a2054..952d38b68 100644
--- a/sql/cambios.sql
+++ b/sql/cambios.sql
@@ -11980,5 +11980,8 @@ AND crs_usr.UsrCod=crs_grp_usr.UsrCod)
 ) AS available_grp_types;
 
 
+SELECT crs_grp.GrpCod FROM crs_grp,crs_grp_types WHERE crs_grp_types.CrsCod=21 AND crs_grp_types.GrpTypCod=crs_grp.GrpTypCod;
 
 
+DELETE FROM file_view USING file_view,files WHERE files.FileBrowser IN (11,26,5,13) AND files.Cod IN (SELECT crs_grp.GrpCod FROM crs_grp_types,crs_grp WHERE crs_grp_types.CrsCod=21 AND crs_grp_types.GrpTypCod=crs_grp.GrpTypCod) AND files.FilCod=file_view.FilCod;
+
diff --git a/swad_changelog.h b/swad_changelog.h
index a95b044ba..aa3b7b76f 100644
--- a/swad_changelog.h
+++ b/swad_changelog.h
@@ -256,14 +256,17 @@
 /****************************** Public constants *****************************/
 /*****************************************************************************/
 
-#define Log_PLATFORM_VERSION	"SWAD 17.21.3 (2017-10-08)"
+#define Log_PLATFORM_VERSION	"SWAD 17.21.4 (2017-10-08)"
 #define CSS_FILE		"swad17.0.css"
 #define JS_FILE			"swad17.17.1.js"
 
 // Number of lines (includes comments but not blank lines) has been got with the following command:
 // nl swad*.c swad*.h css/swad*.css py/swad*.py js/swad*.js soap/swad*?.h sql/swad*.sql | tail -1
 /*
-        Version 17.21.3:  Oct 08, 2017  Remove project files when removing project. (233169 lines)
+        Version 17.21.4:  Oct 08, 2017  Fixed bug: remove group files from database when removing course.
+					Removed project files from database when removing course.
+					Fixed bug in project documents. (233330 lines)
+        Version 17.21.3:  Oct 08, 2017  Remove project files from database when removing project. (233169 lines)
         Version 17.21.2:  Oct 08, 2017  Renamed root folder for project documents. (233115 lines)
         Version 17.21.1:  Oct 08, 2017  Remove project directories when removing project. (233114 lines)
         Version 17.21:    Oct 07, 2017  Start and end dates in projects are replaced by time of creation and time of modification. (233106 lines)
diff --git a/swad_course.c b/swad_course.c
index 3337f6466..f31a9d1b7 100644
--- a/swad_course.c
+++ b/swad_course.c
@@ -2191,6 +2191,12 @@ static void Crs_EmptyCourseCompletely (long CrsCod)
       sprintf (Query,"DELETE FROM crs_record_fields WHERE CrsCod=%ld",CrsCod);
       DB_QueryDELETE (Query,"can not remove fields of cards in a course");
 
+      /***** Remove information related to files in course,
+             including groups and projects,
+             so this function must be called
+             before removing groups and projects *****/
+      Brw_RemoveCrsFilesFromDB (CrsCod);
+
       /***** Remove assignments of the course *****/
       Asg_RemoveCrsAssignments (CrsCod);
 
@@ -2258,9 +2264,6 @@ static void Crs_EmptyCourseCompletely (long CrsCod)
 	       CrsCod);
       DB_QueryDELETE (Query,"can not remove users from a course");
 
-      /***** Remove information related to files in course *****/
-      Brw_RemoveCrsFilesFromDB (CrsCod);
-
       /***** Remove directories of the course *****/
       sprintf (PathRelCrs,"%s/%s/%ld",
 	       Cfg_PATH_SWAD_PRIVATE,Cfg_FOLDER_CRS,CrsCod);
diff --git a/swad_file_browser.c b/swad_file_browser.c
index d43321c44..ea778c0c9 100644
--- a/swad_file_browser.c
+++ b/swad_file_browser.c
@@ -4547,11 +4547,14 @@ void Brw_RemoveDegFilesFromDB (long DegCod)
 /*****************************************************************************/
 /************ Remove files related to a course from the database *************/
 /*****************************************************************************/
-// This function assumes that all the groups in the course have been removed before
+/* Remove information related to files in course,
+   including groups and projects,
+   so this function must be called
+   before removing groups and projects */
 
 void Brw_RemoveCrsFilesFromDB (long CrsCod)
   {
-   char Query[512];
+   char Query[1024];
 
    /***** Remove format of files of marks *****/
    sprintf (Query,"DELETE FROM marks_properties USING files,marks_properties"
@@ -4563,6 +4566,7 @@ void Brw_RemoveCrsFilesFromDB (long CrsCod)
    DB_QueryDELETE (Query,"can not remove the properties of marks associated to a course");
 
    /***** Remove from database the entries that store the file views *****/
+   /* Remove from course file zones */
    sprintf (Query,"DELETE FROM file_view USING file_view,files"
 		  " WHERE files.FileBrowser IN (%u,%u,%u,%u,%u,%u)"
 		  " AND files.Cod=%ld"
@@ -4576,7 +4580,33 @@ void Brw_RemoveCrsFilesFromDB (long CrsCod)
 	    CrsCod);
    DB_QueryDELETE (Query,"can not remove file views to files of a course");
 
+   /* Remove from group file zones */
+   sprintf (Query,"DELETE FROM file_view USING file_view,files"
+		  " WHERE files.FileBrowser IN (%u,%u,%u,%u)"
+		  " AND files.Cod IN"
+		  " (SELECT crs_grp.GrpCod FROM crs_grp_types,crs_grp"
+		  " WHERE crs_grp_types.CrsCod=%ld"
+		  " AND crs_grp_types.GrpTypCod=crs_grp.GrpTypCod)"
+		  " AND files.FilCod=file_view.FilCod",
+	    (unsigned) Brw_ADMI_DOC_GRP,
+	    (unsigned) Brw_ADMI_TCH_GRP,
+	    (unsigned) Brw_ADMI_SHR_GRP,
+	    (unsigned) Brw_ADMI_MRK_GRP,
+	    CrsCod);
+   DB_QueryDELETE (Query,"can not remove file views to files of a course");
+
+   /* Remove from project file zones */
+   sprintf (Query,"DELETE FROM file_view USING file_view,files"
+		  " WHERE files.FileBrowser IN (%u)"
+		  " AND files.Cod IN"
+		  " (SELECT PrjCod FROM projects WHERE CrsCod=%ld)"
+		  " AND files.FilCod=file_view.FilCod",
+	    (unsigned) Brw_ADMI_DOC_PRJ,
+	    CrsCod);
+   DB_QueryDELETE (Query,"can not remove file views to files of a course");
+
    /***** Remove from database expanded folders *****/
+   /* Remove from course file zones */
    sprintf (Query,"DELETE LOW_PRIORITY FROM expanded_folders"
 		  " WHERE FileBrowser IN (%u,%u,%u,%u,%u,%u,%u,%u)"
 		  " AND Cod=%ld",
@@ -4591,7 +4621,31 @@ void Brw_RemoveCrsFilesFromDB (long CrsCod)
 	    CrsCod);
    DB_QueryDELETE (Query,"can not remove expanded folders of a course");
 
+   /* Remove from group file zones */
+   sprintf (Query,"DELETE LOW_PRIORITY FROM expanded_folders"
+		  " WHERE FileBrowser IN (%u,%u,%u,%u)"
+		  " AND Cod IN"
+		  " (SELECT crs_grp.GrpCod FROM crs_grp_types,crs_grp"
+		  " WHERE crs_grp_types.CrsCod=%ld"
+		  " AND crs_grp_types.GrpTypCod=crs_grp.GrpTypCod)",
+	    (unsigned) Brw_ADMI_DOC_GRP,
+	    (unsigned) Brw_ADMI_TCH_GRP,
+	    (unsigned) Brw_ADMI_SHR_GRP,
+	    (unsigned) Brw_ADMI_MRK_GRP,
+	    CrsCod);
+   DB_QueryDELETE (Query,"can not remove expanded folders of a course");
+
+   /* Remove from project file zones */
+   sprintf (Query,"DELETE LOW_PRIORITY FROM expanded_folders"
+		  " WHERE FileBrowser IN (%u)"
+		  " AND Cod IN"
+		  " (SELECT PrjCod FROM projects WHERE CrsCod=%ld)",
+	    (unsigned) Brw_ADMI_DOC_PRJ,
+	    CrsCod);
+   DB_QueryDELETE (Query,"can not remove expanded folders of a course");
+
    /***** Remove from database the entries that store clipboards *****/
+   /* Remove from course file zones */
    sprintf (Query,"DELETE FROM clipboard"
 		  " WHERE FileBrowser IN (%u,%u,%u,%u,%u,%u,%u,%u)"
 		  " AND Cod=%ld",
@@ -4606,9 +4660,33 @@ void Brw_RemoveCrsFilesFromDB (long CrsCod)
 	    CrsCod);
    DB_QueryDELETE (Query,"can not remove clipboards related to files of a course");
 
+   /* Remove from group file zones */
+   sprintf (Query,"DELETE FROM clipboard"
+		  " WHERE FileBrowser IN (%u,%u,%u,%u)"
+		  " AND Cod IN"
+		  " (SELECT crs_grp.GrpCod FROM crs_grp_types,crs_grp"
+		  " WHERE crs_grp_types.CrsCod=%ld"
+		  " AND crs_grp_types.GrpTypCod=crs_grp.GrpTypCod)",
+	    (unsigned) Brw_ADMI_DOC_GRP,
+	    (unsigned) Brw_ADMI_TCH_GRP,
+	    (unsigned) Brw_ADMI_SHR_GRP,
+	    (unsigned) Brw_ADMI_MRK_GRP,
+	    CrsCod);
+   DB_QueryDELETE (Query,"can not remove clipboards related to files of a course");
+
+   /* Remove from project file zones */
+   sprintf (Query,"DELETE FROM clipboard"
+		  " WHERE FileBrowser IN (%u)"
+		  " AND Cod IN"
+		  " (SELECT PrjCod FROM projects WHERE CrsCod=%ld)",
+	    (unsigned) Brw_ADMI_DOC_PRJ,
+	    CrsCod);
+   DB_QueryDELETE (Query,"can not remove clipboards related to files of a course");
+
    /***** Remove from database the entries that store the last time users visited file zones *****/
    // Assignments and works are stored as one in file_browser_last...
    // ...because a user views them at the same time
+   /* Remove from course file zones */
    sprintf (Query,"DELETE FROM file_browser_last"
 		  " WHERE FileBrowser IN (%u,%u,%u,%u,%u)"
 		  " AND Cod=%ld",
@@ -4620,7 +4698,31 @@ void Brw_RemoveCrsFilesFromDB (long CrsCod)
 	    CrsCod);
    DB_QueryDELETE (Query,"can not remove file last visits to files of a course");
 
+   /* Remove from group file zones */
+   sprintf (Query,"DELETE FROM file_browser_last"
+		  " WHERE FileBrowser IN (%u,%u,%u,%u)"
+		  " AND Cod IN"
+		  " (SELECT crs_grp.GrpCod FROM crs_grp_types,crs_grp"
+		  " WHERE crs_grp_types.CrsCod=%ld"
+		  " AND crs_grp_types.GrpTypCod=crs_grp.GrpTypCod)",
+	    (unsigned) Brw_ADMI_DOC_GRP,
+	    (unsigned) Brw_ADMI_TCH_GRP,
+	    (unsigned) Brw_ADMI_SHR_GRP,
+	    (unsigned) Brw_ADMI_MRK_GRP,
+	    CrsCod);
+   DB_QueryDELETE (Query,"can not remove file last visits to files of a course");
+
+   /* Remove from project file zones */
+   sprintf (Query,"DELETE FROM file_browser_last"
+		  " WHERE FileBrowser IN (%u)"
+		  " AND Cod IN"
+		  " (SELECT PrjCod FROM projects WHERE CrsCod=%ld)",
+	    (unsigned) Brw_ADMI_DOC_PRJ,
+	    CrsCod);
+   DB_QueryDELETE (Query,"can not remove file last visits to files of a course");
+
    /***** Remove from database the entries that store the sizes of the file zones *****/
+   /* Remove from course file zones */
    sprintf (Query,"DELETE FROM file_browser_size"
 		  " WHERE FileBrowser IN (%u,%u,%u,%u,%u,%u)"
 		  " AND Cod=%ld",
@@ -4633,7 +4735,31 @@ void Brw_RemoveCrsFilesFromDB (long CrsCod)
 	    CrsCod);
    DB_QueryDELETE (Query,"can not remove sizes of file zones of a course");
 
+   /* Remove from group file zones */
+   sprintf (Query,"DELETE FROM file_browser_size"
+		  " WHERE FileBrowser IN (%u,%u,%u,%u)"
+		  " AND Cod IN"
+		  " (SELECT crs_grp.GrpCod FROM crs_grp_types,crs_grp"
+		  " WHERE crs_grp_types.CrsCod=%ld"
+		  " AND crs_grp_types.GrpTypCod=crs_grp.GrpTypCod)",
+	    (unsigned) Brw_ADMI_DOC_GRP,
+	    (unsigned) Brw_ADMI_TCH_GRP,
+	    (unsigned) Brw_ADMI_SHR_GRP,
+	    (unsigned) Brw_ADMI_MRK_GRP,
+	    CrsCod);
+   DB_QueryDELETE (Query,"can not remove sizes of file zones of a course");
+
+   /* Remove from project file zones */
+   sprintf (Query,"DELETE FROM file_browser_size"
+		  " WHERE FileBrowser IN (%u)"
+		  " AND Cod IN"
+		  " (SELECT PrjCod FROM projects WHERE CrsCod=%ld)",
+	    (unsigned) Brw_ADMI_DOC_PRJ,
+	    CrsCod);
+   DB_QueryDELETE (Query,"can not remove sizes of file zones of a course");
+
    /***** Remove from database the entries that store the data files *****/
+   /* Remove from course file zones */
    sprintf (Query,"DELETE FROM files"
 		  " WHERE FileBrowser IN (%u,%u,%u,%u,%u,%u)"
 		  " AND Cod=%ld",
@@ -4645,6 +4771,29 @@ void Brw_RemoveCrsFilesFromDB (long CrsCod)
 	    (unsigned) Brw_ADMI_MRK_CRS,
 	    CrsCod);
    DB_QueryDELETE (Query,"can not remove files of a course");
+
+   /* Remove from group file zones */
+   sprintf (Query,"DELETE FROM files"
+		  " WHERE FileBrowser IN (%u,%u,%u,%u)"
+		  " AND Cod IN"
+		  " (SELECT crs_grp.GrpCod FROM crs_grp_types,crs_grp"
+		  " WHERE crs_grp_types.CrsCod=%ld"
+		  " AND crs_grp_types.GrpTypCod=crs_grp.GrpTypCod)",
+	    (unsigned) Brw_ADMI_DOC_GRP,
+	    (unsigned) Brw_ADMI_TCH_GRP,
+	    (unsigned) Brw_ADMI_SHR_GRP,
+	    (unsigned) Brw_ADMI_MRK_GRP,
+	    CrsCod);
+   DB_QueryDELETE (Query,"can not remove files of a course");
+
+   /* Remove from project file zones */
+   sprintf (Query,"DELETE FROM files"
+		  " WHERE FileBrowser IN (%u)"
+		  " AND Cod IN"
+		  " (SELECT PrjCod FROM projects WHERE CrsCod=%ld)",
+	    (unsigned) Brw_ADMI_DOC_PRJ,
+	    CrsCod);
+   DB_QueryDELETE (Query,"can not remove files of a course");
   }
 
 /*****************************************************************************/
@@ -11177,6 +11326,8 @@ long Brw_GetCodForFiles (void)
       case Brw_ADMI_SHR_GRP:
       case Brw_ADMI_MRK_GRP:
 	 return Gbl.CurrentCrs.Grps.GrpCod;
+      case Brw_ADMI_DOC_PRJ:
+	 return Gbl.CurrentCrs.Prjs.PrjCod;
       default:
          return -1L;
      }
@@ -11220,6 +11371,7 @@ void Brw_GetCrsGrpFromFileMetadata (Brw_FileBrowser_t FileBrowser,long Cod,
      {
       case Brw_ADMI_DOC_INS:
       case Brw_ADMI_SHR_INS:
+	 /* Cod stores the institution code */
 	 *GrpCod = -1L;
 	 *CrsCod = -1L;
 	 *DegCod = -1L;
@@ -11228,6 +11380,7 @@ void Brw_GetCrsGrpFromFileMetadata (Brw_FileBrowser_t FileBrowser,long Cod,
          break;
       case Brw_ADMI_DOC_CTR:
       case Brw_ADMI_SHR_CTR:
+	 /* Cod stores the centre code */
 	 *GrpCod = -1L;
 	 *CrsCod = -1L;
 	 *DegCod = -1L;
@@ -11237,6 +11390,7 @@ void Brw_GetCrsGrpFromFileMetadata (Brw_FileBrowser_t FileBrowser,long Cod,
          break;
       case Brw_ADMI_DOC_DEG:
       case Brw_ADMI_SHR_DEG:
+	 /* Cod stores the degree code */
 	 *GrpCod = -1L;
 	 *CrsCod = -1L;
 	 *DegCod = Deg.DegCod = Cod;
@@ -11251,6 +11405,7 @@ void Brw_GetCrsGrpFromFileMetadata (Brw_FileBrowser_t FileBrowser,long Cod,
       case Brw_ADMI_ASG_USR:
       case Brw_ADMI_WRK_USR:
       case Brw_ADMI_MRK_CRS:
+	 /* Cod stores the course code */
 	 *GrpCod = -1L;
 	 *CrsCod = Crs.CrsCod = Cod;
 	 Crs_GetDataOfCourseByCod (&Crs);
@@ -11264,6 +11419,7 @@ void Brw_GetCrsGrpFromFileMetadata (Brw_FileBrowser_t FileBrowser,long Cod,
       case Brw_ADMI_TCH_GRP:
       case Brw_ADMI_SHR_GRP:
       case Brw_ADMI_MRK_GRP:
+	 /* Cod stores the group code */
 	 *GrpCod = GrpDat.GrpCod = Cod;
 	 Grp_GetDataOfGroupByCod (&GrpDat);
 	 *CrsCod = Crs.CrsCod = GrpDat.CrsCod;
@@ -11274,6 +11430,17 @@ void Brw_GetCrsGrpFromFileMetadata (Brw_FileBrowser_t FileBrowser,long Cod,
 	 Ctr_GetDataOfCentreByCod (&Ctr);
 	 *InsCod = Ctr.InsCod;
 	 break;
+      case Brw_ADMI_DOC_PRJ:
+	 /* Cod stores the project code */
+	 *GrpCod = -1L;
+	 *CrsCod = Crs.CrsCod = Prj_GetCourseOfProject (Cod);
+	 Crs_GetDataOfCourseByCod (&Crs);
+	 *DegCod = Deg.DegCod = Crs.DegCod;
+	 Deg_GetDataOfDegreeByCod (&Deg);
+	 *CtrCod = Ctr.CtrCod = Deg.CtrCod;
+	 Ctr_GetDataOfCentreByCod (&Ctr);
+	 *InsCod = Ctr.InsCod;
+	 break;
       default:
 	 *GrpCod = -1L;
 	 *CrsCod = -1L;