/usr/share/gnome-software/modulesets.d/system.xml is in gnome-software-common 3.20.1+git20160420.1.ca63436.ubuntu-xenial-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | <!-- Unremovable system apps -->
<moduleset name="system">
<module type="application">eog.desktop</module>
<module type="application">epiphany.desktop</module>
<module type="application">evince.desktop</module>
<module type="application">gnome-calculator.desktop</module>
<module type="application">gnome-control-center.desktop</module>
<module type="application">gnome-system-monitor.desktop</module>
<module type="application">org.gnome.baobab.desktop</module>
<module type="application">org.gnome.Characters.desktop</module>
<module type="application">org.gnome.Contacts.desktop</module>
<module type="application">org.gnome.DiskUtility.desktop</module>
<module type="application">org.gnome.font-viewer.desktop</module>
<module type="application">org.gnome.gedit.desktop</module>
<module type="application">org.gnome.Nautilus.desktop</module>
<module type="application">org.gnome.Screenshot.desktop</module>
<module type="application">org.gnome.Software.desktop</module>
<module type="application">org.gnome.Terminal.desktop</module>
<module type="application">org.gnome.Totem.desktop</module>
<module type="application">yelp.desktop</module>
</moduleset>
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