/usr/share/app-install/desktop/mame:mame.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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | [Desktop Entry]
X-AppInstall-Package=mame
X-AppInstall-Popcon=119
X-AppInstall-Section=multiverse
Name=MAME™ Arcade Emulator
GenericName=Arcade Emulator
Comment=Play vintage arcade games using the MAME emulator
Exec=/usr/games/mame
Icon=mame
Terminal=false
Type=Application
Categories=Game;Emulator;
X-Ubuntu-Gettext-Domain=app-install-data
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