This file is indexed.

/usr/share/mate-power-manager/ui/brightness-applet-menu.xml is in mate-power-manager-common 1.16.2-1+deb9u1.

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

The actual contents of the file can be viewed below.

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<menuitem name="Help" action="Help" />
<menuitem name="About" action="About" />