/usr/share/mime/packages/banshee-amz.xml is in banshee 2.9.0+really2.6.2-7ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | <?xml version="1.0" encoding="UTF-8"?>
<mime-info xmlns='http://www.freedesktop.org/standards/shared-mime-info'>
<mime-type type="audio/x-amzxml">
<generic-icon name="package-x-generic"/>
<comment>Amazon MP3 Purchase Playlist</comment>
<glob pattern="*.amz"/>
</mime-type>
</mime-info>
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