This file is indexed.

/usr/share/gdm/greeter-settings/xy_desktop-base.gschema.override is in desktop-base 6.0.7ubuntu1.

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

The actual contents of the file can be viewed below.

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[org.gnome.desktop.background]
picture-uri='file:///usr/share/images/desktop-base/login-background.svg'
picture-options='zoom'