Let's assume I have a program X that uses files with the extension .xez. How can I make X the default application for all files with the extension .xez?

My first idea was xdg-mime default X.desktop application/.xez. Yet this does not work.

Files with the extension .xez are still associated with Gnome Archive Manager since files with .xez represent a sort of .zip archive.

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    I suppose it works based on MIME types, that is, the actual file type, not extensions... are you sure ".xez" files aren't actually a ZIP archive? What's the output of "file whatever.xez"? – njsg Dec 12 '12 at 8:16
  • I guess you're right: [orschiro@thinkpad ~]$ file testfile.pez testfile.pez: Zip archive data, at least v1.0 to extract. Is there any way to link .pez to X whilst still preserving .zip to be opened with File Roller? – orschiro Dec 13 '12 at 0:27

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