/usr/share/mime/packages/calibre.xml is in calibre 1.25.0+dfsg-1build1.
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 9 | <?xml version="1.0" encoding="UTF-8"?>
<mime-info xmlns="http://www.freedesktop.org/standards/shared-mime-info">
<mime-type type="x-content/ebook-reader">
<comment>E-Book reader</comment>
<treemagic>
<treematch type="file" path="driveinfo.calibre"/>
</treemagic>
</mime-type>
</mime-info>
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