This file is indexed.

/etc/X11/Xsession.d/81overlay-scrollbar is in overlay-scrollbar 0.2.17.1+16.04.20151117-0ubuntu1.

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

The actual contents of the file can be viewed below.

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# This file is sourced by Xsession(5), not executed.

if [ -z "$GTK2_MODULES" ] ; then
	GTK2_MODULES="overlay-scrollbar"
else
	GTK2_MODULES="$GTK2_MODULES:overlay-scrollbar"
fi

export GTK2_MODULES