/usr/share/app-install/desktop/atanks:atanks.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.
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X-AppInstall-Package=atanks
X-AppInstall-Popcon=9
X-AppInstall-Section=universe
Name=Atomic Tanks
Comment=Destroy your opponents' tanks.
Type=Application
Exec=atanks
Icon=atanks
Categories=Game;ArcadeGame;
Terminal=false
X-Ubuntu-Gettext-Domain=app-install-data
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