Thanks... so it doesn't get the correct mimetypes for some reason. Could you please call grep -R "x-extension" ~/.local/share/mime and paste the output here? I have the bad feeling that you already assigned a mimetype to files with those extensions for your user which then overrides the system settings.
-- Some audio files have wrong icons https://launchpad.net/bugs/41285 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs