/usr/share/app-install/desktop/quodlibet:quodlibet.desktop is in app-install-data 15.10.
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=quodlibet
X-AppInstall-Popcon=68
X-AppInstall-Section=universe
Name=Quod Libet
GenericName=Music Player
Comment=Listen to, browse, or edit your audio collection
Exec=quodlibet --run --play-file %u
MimeType=application/x-flac;audio/aac;audio/midi;audio/mp3;audio/mp4;audio/mpeg;audio/mpeg4;audio/mpg;audio/ogg;audio/vorbis;audio/wav;audio/wave;audio/x-aac;audio/x-flac;audio/x-m4a;audio/x-midi;audio/x-mp3;audio/x-mpc;audio/x-mpeg;audio/x-ms-wma;audio/x-ms-wmv;audio/x-musepack;audio/x-oggflac;audio/x-speex;audio/x-tta;audio/x-wav;audio/x-wavpack;audio/x-wma;video/ogg;video/x-ms-asf;video/x-theora;video/x-wmv;
Terminal=false
StartupNotify=true
Type=Application
Icon=quodlibet
Categories=AudioVideo;Audio;Player;GTK;
#http://live.gnome.org/GnomeGoals/NotificationSource
X-GNOME-UsesNotifications=true
X-Ubuntu-Gettext-Domain=app-install-data
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