/usr/share/app-install/desktop/gravitywars:gravitywars.desktop is in app-install-data 0.12.04.4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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X-AppInstall-Package=gravitywars
X-AppInstall-Popcon=48
X-AppInstall-Section=universe
Name=Gravity Wars
GenericName=gravitywars
Comment=Test your skills against gravity
Type=Application
Exec=gravitywars
Icon=gravitywars
Terminal=false
Categories=Game;ArcadeGame;
X-Ubuntu-Gettext-Domain=app-install-data
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