MIME type inode/directory causes weird behavior on Linux
Because you add inode/directory in the audacious.desktop file, it makes some software to use audacious by default to open folders instead of nautilus on Gnome, eg, Firefox with "Open Containing Folder" for downloads. I believe it is because of this result:
$ grep "inode/directory" /usr/share/applications/mimeinfo.cache
I'm able to fix this by selecting "Forget association" in the "Open With Other Application..." interface through the context menu of a folder, but it may be annoying to less experienced Gnome (or others) users.
I'm on Arch Linux with GNOME 3.4.2, Firefox 15.0, desktop-file-utils 0.20.