/usr/share/app-install/desktop/fceux:fceux.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=fceux
X-AppInstall-Popcon=135
X-AppInstall-Section=universe
Type=Application
Version=1.0
Name=Fceux
GenericName=NES/Famicom emulator
NoDisplay=false
Comment=Emulate NES ROMs
Exec=/usr/games/fceux
Icon=_usr_share_pixmaps_fceux
Terminal=false
MimeType=application/x-nes-rom
Categories=Game;Emulator;
Encoding=UTF-8
X-Ubuntu-Gettext-Domain=app-install-data
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