/usr/share/app-install/desktop/einstein:einstein.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=einstein
X-AppInstall-Popcon=235
X-AppInstall-Section=universe
Version=1.0
Encoding=UTF-8
Name=Einstein
Comment="Puzzle game inspired on Einstein's puzzle"
Exec=einstein
Icon=einstein
Terminal=false
Type=Application
Categories=Game;LogicGame;
StartupNotify=false
X-Ubuntu-Gettext-Domain=app-install-data
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