Index: code/qcommon/files.c
===================================================================
--- code/qcommon/files.c	(revision 1390)
+++ code/qcommon/files.c	(working copy)
@@ -495,6 +495,29 @@
 }
 
 /*
+ * FS_CheckProtectedFileExtention
+ *
+ * Return 1 - If Filename a protected
+ *          - Show a error message
+ *          - The write action must be stopped
+ * Return 0 - The write action can continue
+ */
+int FS_CheckProtectedFileExtention( const char *filename, const char *function )
+{
+	/* check if filename end by the lib extention (commonly .dll or .so) */
+	if ( Q_stricmp( filename + strlen( filename ) - strlen( DLL_EXT ),
+	                DLL_EXT ) == 0 )
+	{
+		Com_Error( ERR_FATAL,
+			"%s: Protected file extention. Can not write '%s'\n",
+			function, filename );
+		return 1;
+	}
+	return 0;
+}
+
+
+/*
 =================
 FS_CopyFile
 
@@ -508,6 +531,9 @@
 
 	Com_Printf( "copy %s to %s\n", fromOSPath, toOSPath );
 
+	if( FS_CheckProtectedFileExtention( toOSPath, __FUNCTION__ ) )
+		return;
+
 	if (strstr(fromOSPath, "journal.dat") || strstr(fromOSPath, "journaldata.dat")) {
 		Com_Printf( "Ignoring journal files\n");
 		return;
@@ -549,6 +575,9 @@
 ===========
 */
 void FS_Remove( const char *osPath ) {
+	if( FS_CheckProtectedFileExtention( osPath, __FUNCTION__ ) )
+		return;
+
 	remove( osPath );
 }
 
@@ -559,6 +588,9 @@
 ===========
 */
 void FS_HomeRemove( const char *homePath ) {
+	if( FS_CheckProtectedFileExtention( homePath, __FUNCTION__ ) )
+		return;
+
 	remove( FS_BuildOSPath( fs_homepath->string,
 			fs_gamedir, homePath ) );
 }
@@ -636,6 +668,9 @@
 		Com_Printf( "FS_SV_FOpenFileWrite: %s\n", ospath );
 	}
 
+	if( FS_CheckProtectedFileExtention( ospath, __FUNCTION__ ) )
+		return 0;
+
 	if( FS_CreatePath( ospath ) ) {
 		return 0;
 	}
@@ -745,6 +780,9 @@
 		Com_Printf( "FS_SV_Rename: %s --> %s\n", from_ospath, to_ospath );
 	}
 
+	if( FS_CheckProtectedFileExtention( to_ospath, __FUNCTION__ ) )
+		return;
+
 	if (rename( from_ospath, to_ospath )) {
 		// Failed, try copying it and deleting the original
 		FS_CopyFile ( from_ospath, to_ospath );
@@ -777,6 +815,9 @@
 		Com_Printf( "FS_Rename: %s --> %s\n", from_ospath, to_ospath );
 	}
 
+	if( FS_CheckProtectedFileExtention( to_ospath, __FUNCTION__ ) )
+		return;
+
 	if (rename( from_ospath, to_ospath )) {
 		// Failed, try copying it and deleting the original
 		FS_CopyFile ( from_ospath, to_ospath );
@@ -838,6 +879,9 @@
 		Com_Printf( "FS_FOpenFileWrite: %s\n", ospath );
 	}
 
+	if( FS_CheckProtectedFileExtention( ospath, __FUNCTION__ ) )
+		return 0;
+
 	if( FS_CreatePath( ospath ) ) {
 		return 0;
 	}
@@ -884,6 +928,9 @@
 		Com_Printf( "FS_FOpenFileAppend: %s\n", ospath );
 	}
 
+	if( FS_CheckProtectedFileExtention( ospath, __FUNCTION__ ) )
+		return 0;
+
 	if( FS_CreatePath( ospath ) ) {
 		return 0;
 	}