Comment 4 for bug 416916

heh ... it may not be a bug, but I think there is a valid feature request here because it's happened again, only differently and now all my mp3s are listed as "MP3 Documents" with the mimetype application/x-extension-mp3 which does not trigger preview -- for a casual user, this would be utterly perplexing and even for me with 20 years Unix experience it's a tough nut to crack.

here's the feature request: How about a "reset to factory default" option for Mime-types somewhere under the System Admin suite?