This file is indexed.

/etc/X11/Xsession.d/90atk-adaptor is in libatk-adaptor 2.18.1-2ubuntu1.

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

The actual contents of the file can be viewed below.

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# -*- sh -*-
# Xsession.d script to set the GTK_MODULES env variable to load atk
#
# This file is sourced by Xsession(5), not executed.

add_module()
{
	case :$GTK_MODULES: in
		*:$1:*)
			;;
		*)
			if [ -z "$GTK_MODULES" ]
			then
				GTK_MODULES=$1
			else
				GTK_MODULES=$GTK_MODULES:$1
			fi
			;;
	esac
}

add_module gail
add_module atk-bridge

export GTK_MODULES