/usr/share/app-install/desktop/criticalmass-data:criticalmass.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 | [Desktop Entry]
X-AppInstall-Package=criticalmass
X-AppInstall-Popcon=12
X-AppInstall-Section=universe
Name=Criticalmass
Comment=Play a shoot-em-up a la galaxian
Exec=critter
Icon=critter
StartupNotify=false
Terminal=false
Type=Application
Categories=Game;ArcadeGame;
X-Ubuntu-Gettext-Domain=app-install-data
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