/usr/share/applications/calf.desktop is in calf-plugins 0.0.18.6-3.
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 11 | [Desktop Entry]
Encoding=UTF-8
Name=Calf Plugin Pack for JACK
Name[pl]=Zestaw wtyczek Calf
Comment=Process and produce sounds using a set of plugins with JACK interface
Comment[pl]=Przetwarzaj i generuj dźwięk używając zestawu wtyczek zgodnych z JACK
Exec=calfjackhost
Terminal=false
Type=Application
Categories=Application;AudioVideo;Audio
Icon=calf
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