/usr/lib/mime/packages/playmidi is in playmidi 2.4debian-10.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | audio/midi; xplaymidi `cat /etc/playmidi/playmidi.conf` %s; test=test -n "$DISPLAY"; description=MIDI audio file
audio/midi; playmidi `cat /etc/playmidi/playmidi.conf` %s; description=MIDI audio file
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