/usr/share/applications/muse.desktop is in muse 2.1.2-3.
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 10 | [Desktop Entry]
Name=MusE
GenericName=Audio/MIDI Sequencer
Comment=Midi Music Editor
Icon=muse_icon
Type=Application
Exec=muse %f
Terminal=false
Categories=Sequencer;Midi;X-Jack;X-Sequencers;X-MIDI;Audio;AudioVideo;
MimeType=audio/midi;application/x-muse;application/xml;
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