/usr/lib/mime/packages/tar is in tar 1.29b-1.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | application/x-tar; /bin/tar tvf '%s'; print=/bin/tar tvf - | print text/plain:-; copiousoutput ; priority=1
application/x-gtar; /bin/tar tvf '%s'; print=/bin/tar tvf - | print text/plain:-; copiousoutput ; priority=1
application/x-ustar; /bin/tar tvf '%s'; print=/bin/tar tvf - | print text/plain:-; copiousoutput ; priority=1
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