On Mon, Sep 12, 2011 at 12:50:06AM +0200, Philipp Überbacher wrote: > Is this config file also managed through gconf or something? I mean I > really appreciate that it's a text file but it's the first time I heard > of it and it seems this kind of stuff changes faster than I can say wtf > (text files to xdg files to gconf to other xdg files). I'm really No. Both GNOME ("Open with"/"Preferred programs") and KDE 4 edit the file directly; Gconf is generally not used anymore for file type associations. See the "MIME Actions specification" on freedesktop: <http://www.freedesktop.org/wiki/Specifications/mime-actions-spec> > confused. I also wonder what the strange additional strings in there > mean, example: > application/x-extension-html=userapp-Firefox-3WKO0V.desktop "application/x-extension-html" probably means all files having the '.html' extension, regardless of automatically-determined MIME type. (For example, if you rename a .jpeg file to .html, it will *still* be detected as image/jpeg, but matching by extension will take priority.) "userapp-*.desktop" files are created when you manually specify the path to your program in the "Open With..." window (the 'other' choice).