This file is indexed.

/etc/X11/Xsession.d/80appmenu-gtk3 is in appmenu-gtk3 0.3.92-0ubuntu1.

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

The actual contents of the file can be viewed below.

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if [ -f /usr/lib/gtk-3.0/3.0.0/menuproxies/libappmenu.so ]
then
	export UBUNTU_MENUPROXY="libappmenu.so"
fi