/usr/share/app-install/desktop/gtk-3-examples:gtk3-widget-factory.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=gtk-3-examples
X-AppInstall-Popcon=11
X-AppInstall-Section=main
Name=Widget Factory
Comment=A showcase for GTK+ widgets, designed for testing themes.
Exec=gtk3-widget-factory
Icon=gtk3-widget-factory
Terminal=false
Type=Application
StartupNotify=true
Categories=GTK;
NoDisplay=true
X-Ubuntu-Gettext-Domain=app-install-data
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