/usr/share/app-install/desktop/marsshooter:mars.desktop is in app-install-data 15.10.
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 12 13 14 15 16 17 | [Desktop Entry]
X-AppInstall-Package=marsshooter
X-AppInstall-Popcon=1
X-AppInstall-Section=universe
Type=Application
Name=M.A.R.S.
GenericName=Shooter Game
Comment=M.A.R.S. - a ridiculous shooter
Exec=mars
Icon=mars
Terminal=false
Categories=Game;ActionGame;
StartupNotify=false
Keywords=ships;space;shooter;2D;opengl;sfml;shader;particle;effects;multiplayer;
X-Ubuntu-Gettext-Domain=app-install-data
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