Linux: update xdg-utils to the latest version to get relevant xdg-mime fixes.

scripts/xdg-icon-resource

 #!/bin/sh
 #---------------------------------------------
 #   xdg-icon-resource
 #
 #   Utility script to install icons on a Linux desktop.
 #
 #   Refer to the usage() function below for usage.
 #
 #   Copyright 2009-2010, Fathi Boudra <fabo@freedesktop.org>
 #   Copyright 2009-2010, Rex Dieter <rdieter@fedoraproject.org>
@@ skipping 378 matching lines @@
     # All output to stderr
     xdg_redirect_output=" >&2"
 fi
 
 #--------------------------------------
 # Checks for known desktop environments
 # set variable DE to the desktop environments name, lowercase
 
 detectDE()
 {
+    # see https://bugs.freedesktop.org/show_bug.cgi?id=34164
+    unset GREP_OPTIONS
+
     if [ x"$KDE_FULL_SESSION" = x"true" ]; then DE=kde;
     elif [ x"$GNOME_DESKTOP_SESSION_ID" != x"" ]; then DE=gnome;
     elif `dbus-send --print-reply --dest=org.freedesktop.DBus /org/freedesktop/DBus org.freedesktop.DBus.GetNameOwner string:org.gnome.SessionManager > /dev/null 2>&1` ; then DE=gnome;
     elif xprop -root _DT_SAVE_MODE 2> /dev/null | grep ' = \"xfce4\"$' >/dev/null 2>&1; then DE=xfce;
+    elif xprop -root 2> /dev/null | grep -i '^xfce_desktop_window' >/dev/null 2>&1; then DE=xfce
     fi
 
     if [ x"$DE" = x"" ]; then
       # fallback to checking $DESKTOP_SESSION
       case "$DESKTOP_SESSION" in
+         gnome)
+           DE=gnome;
          LXDE)
            DE=lxde; 
            ;;
          xfce|xfce4)
            DE=xfce;
            ;;
       esac
     fi
 
     if [ x"$DE" = x"" ]; then
@@ skipping 12 matching lines @@
     fi
 }
 
 #----------------------------------------------------------------------------
 # kfmclient exec/openURL can give bogus exit value in KDE <= 3.5.4
 # It also always returns 1 in KDE 3.4 and earlier
 # Simply return 0 in such case
 
 kfmclient_fix_exit_code()
 {
-    [ x"$KDE_SESSION_VERSION" = x"4" ] && return 0;
     version=`LC_ALL=C.UTF-8 kde-config --version 2>/dev/null | grep '^KDE'`
     major=`echo $version | sed 's/KDE.*: \([0-9]\).*/\1/'`
     minor=`echo $version | sed 's/KDE.*: [0-9]*\.\([0-9]\).*/\1/'`
     release=`echo $version | sed 's/KDE.*: [0-9]*\.[0-9]*\.\([0-9]\).*/\1/'`
     test "$major" -gt 3 && return $1
     test "$minor" -gt 5 && return $1
     test "$release" -gt 4 && return $1
     return 0
 }
 
@@ skipping 409 matching lines @@
 if [ x"$update" = x"yes" ] ; then
     update_icon_database "$xdg_base_dir"
     if [ -n "$dot_icon_dir" ] ; then
         if [ -d "$dot_icon_dir/" -a ! -L "$dot_icon_dir" ] ; then
             update_icon_database $dot_base_dir
         fi
     fi
 fi
 
 exit_success