/usr/share/app-install/desktop/mttroff:mttroff.desktop is in app-install-data 14.04.0.
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=mttroff
X-AppInstall-Popcon=2
X-AppInstall-Section=universe
Version=1.0
Type=Application
Terminal=false
Name=Troff
Icon=mttroff
GenericName=Troff
Exec=mttroff
Categories=Game;ArcadeGame;
Comment=TROff - A libavg based multitouch TRON clone
X-Ubuntu-Gettext-Domain=app-install-data
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