/usr/share/applications/prboom-plus.desktop is in prboom-plus 2:2.5.1.4~svn4356+dfsg1-1.
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 | [Desktop Entry]
Type=Application
Name=PrBoom+
Comment=enhanced clone of the classic first-person shooter Doom
Icon=prboom-plus
TryExec=prboom-plus
Exec=prboom-plus
Categories=Game;ActionGame;
Keywords=first;person;shooter;doom;
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