/usr/share/app-install/desktop/fceu:fceu.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=fceu
X-AppInstall-Popcon=310
X-AppInstall-Section=universe
Type=Application
Version=1.0
Name=FCE Ultra
NoDisplay=true
Comment=Play NES ROMs
Exec=fceu
Terminal=false
MimeType=application/x-nes-rom
Categories=Game
X-Ubuntu-Gettext-Domain=app-install-data
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