diff --git a/icon/filext16x16/ggb16x16.gif b/icon/filext16x16/ggb16x16.gif
new file mode 100644
index 000000000..58fe6a10e
Binary files /dev/null and b/icon/filext16x16/ggb16x16.gif differ
diff --git a/icon/filext16x16/ggt16x16.gif b/icon/filext16x16/ggt16x16.gif
new file mode 100644
index 000000000..58fe6a10e
Binary files /dev/null and b/icon/filext16x16/ggt16x16.gif differ
diff --git a/icon/filext32x32/ggb32x32.gif b/icon/filext32x32/ggb32x32.gif
new file mode 100644
index 000000000..8b892eb45
Binary files /dev/null and b/icon/filext32x32/ggb32x32.gif differ
diff --git a/icon/filext32x32/ggt32x32.gif b/icon/filext32x32/ggt32x32.gif
new file mode 100644
index 000000000..8b892eb45
Binary files /dev/null and b/icon/filext32x32/ggt32x32.gif differ
diff --git a/swad_changelog.h b/swad_changelog.h
index e658d2287..6f22df0ed 100644
--- a/swad_changelog.h
+++ b/swad_changelog.h
@@ -183,13 +183,20 @@
 /****************************** Public constants *****************************/
 /*****************************************************************************/
 
-#define Log_PLATFORM_VERSION	"SWAD 16.81.1 (2016-12-01)"
+#define Log_PLATFORM_VERSION	"SWAD 16.81.2 (2016-12-01)"
 #define CSS_FILE		"swad16.69.css"
 #define JS_FILE			"swad16.46.1.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 16.81.2:  Dec 01, 2016	New file types for GeoGebra, suggested by Sandra Quero Ramones. (209174 lines)
+Copy the following icons to icon public directory:
+sudo cp icon/filext16x16/ggb16x16.gif /var/www/html/swad/icon/filext16x16/
+sudo cp icon/filext16x16/ggt16x16.gif /var/www/html/swad/icon/filext16x16/
+sudo cp icon/filext32x32/ggb32x32.gif /var/www/html/swad/icon/filext32x32/
+sudo cp icon/filext32x32/ggt32x32.gif /var/www/html/swad/icon/filext32x32/
+
         Version 16.81.1:  Dec 01, 2016	Table locations moved to table agendas. (209164 lines)
 					3 changes necessary in database:
 CREATE TABLE IF NOT EXISTS agendas (AgdCod INT NOT NULL AUTO_INCREMENT,UsrCod INT NOT NULL,Hidden ENUM('N','Y') NOT NULL DEFAULT 'N',StartTime DATETIME NOT NULL,EndTime DATETIME NOT NULL,Event VARCHAR(255) NOT NULL,Location VARCHAR(255) NOT NULL,Txt TEXT NOT NULL,UNIQUE INDEX(AgdCod),INDEX(UsrCod,Hidden));
diff --git a/swad_file_browser.c b/swad_file_browser.c
index b1401839e..858370559 100644
--- a/swad_file_browser.c
+++ b/swad_file_browser.c
@@ -1152,6 +1152,8 @@ const char *Brw_FileExtensionsAllowed[] =
    "eps"  ,
    "fdf"  ,
    "flv"  ,
+   "ggb"  ,
+   "ggt"  ,
    "gif"  ,
    "gz"   ,
    "h"    ,
@@ -1282,6 +1284,8 @@ const char *Brw_MIMETypesAllowed[] =
    "application/stream",		// PDF in Mac?
    "application/unknown",
    "application/vnd.fdf",		// Forms Data Format
+   "application/vnd.geogebra.file",	// GeoGebra .ggb
+   "application/vnd.geogebra.tool",	// GeoGebra .ggt
    "application/vnd.msexcel",		// Microsoft Excel .xls
    "application/vnd.ms-excel",		// Microsoft Excel .xls
    "application/vnd.ms-powerpoint",	// Microsoft PowerPoint .ppt or .pps