Exec=nautilus
Icon=system-file-manager
Terminal=false
Type=Application
StartupNotify=true
NoDisplay=true
OnlyShowIn=GNOME;
X-GNOME-Bugzilla-Bugzilla=GNOME
X-GNOME-Bugzilla-Product=nautilus
X-GNOME-Bugzilla-Component=general
X-GNOME-Bugzilla-Version=2.32.2.1
X-GNOME-Autostart-Phase=Desktop
X-GNOME-Autostart-Notify=true
X-GNOME-AutoRestart=true
X-GNOME-Provides=filemanager
AutostartCondition=GNOME /apps/nautilus/preferences/show_desktop
Encoding=UTF-8
X-Desktop-File-Install-Version=0.11
Categories=X-MandrivaLinux-System-FileTools;
It seems to have worked at copy/ paste this time using FireFox 19. The last several attemps were while I was using Chromium.
Now that you've commented the line OnlyShowIn=GNOME; (should now be
#OnlyShowIn=GNOME), comment the line NoDisplay=true, so that it reads
#NoDisplay=true. The NoDisplay line tells the system
not to show the icon. You can also delete both lines entirely, if you wish.
If you have a problem with where the item shows in your menu, post the Categories= line.
EDIT: The NoDisplay= line defines whether the item is displayed in the system menu or not. I suppose you could also set it to
NoDisplay=false, but I've always just deleted the line if I want the menu item shown.