/usr/share/app-install/desktop/muon-updater:kde4__muon-updater.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=muon-updater
X-AppInstall-Popcon=3523
X-AppInstall-Section=universe
Name=Muon Update Manager
Exec=muon-updater %i -caption %c
Icon=system-software-update
Type=Application
X-DocPath=muon/index.html
GenericName=Update Manager
Categories=Qt;KDE;System;
X-Ubuntu-Gettext-Domain=app-install-data
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