/usr/share/app-install/desktop/flightgear:flightgear.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=flightgear
X-AppInstall-Popcon=398
X-AppInstall-Section=universe
Encoding=UTF-8
Type=Application
Version=1.4
Name=FlightGear
Exec=fgfs
Terminal=false
Categories=Game;Simulation;
Comment=A flight simulator
Icon=
X-Ubuntu-Gettext-Domain=app-install-data
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