Chris Rebert <pyb...@rebertia.com> added the comment: The xdg-open source code (http://cgit.freedesktop.org/xdg/xdg-utils/tree/scripts/xdg-open ) shows that exit code 4 is used whenever an invocation of another opener script (e.g. kde-open, gnome-open) fails for any reason besides said script not being installed. So I'm not so sure we can jump to the conclusion that 4 automatically means FileNotFound.
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