This file is indexed.

/usr/share/mate/applications/software-properties-gtk.desktop is in ubuntu-mate-default-settings 16.04.5.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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[Desktop Entry]
Name=Software & Updates
GenericName=Software & Updates
Comment=Configure the sources for installable software and updates
Keywords=Drivers;Repositories;Repository;PPA;
Exec=software-properties-gtk
Icon=software-properties
Terminal=false
X-MultipleArgs=false
Type=Application
NotShowIn=GNOME;
Categories=System;Settings;
X-GNOME-Settings-Panel=software-properties
X-Unity-Settings-Panel=software-properties
MimeType=text/x-apt-sources-list;
X-KDE-SubstituteUID=true
X-Ubuntu-Gettext-Domain=software-properties