/usr/share/app-install/desktop/supertux:supertux2.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=supertux
X-AppInstall-Popcon=1320
X-AppInstall-Section=universe
Type=Application
Version=1.0
Name=SuperTux 2
Comment=Play a classic 2D platform game
Icon=supertux
Exec=supertux2
Terminal=false
StartupNotify=false
Categories=Game;ArcadeGame;
X-Ubuntu-Gettext-Domain=app-install-data
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