/usr/lib/mime/packages/smpeg-plaympeg is in smpeg-plaympeg 0.4.5+cvs20030824-7.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | audio/mpeg; /usr/bin/plaympeg '%s'; description="MPEG audio files"; priority=2
video/mpeg; /usr/bin/plaympeg '%s'; description="MPEG video files"; test=test -n "$DISPLAY"; priority=7
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