This file is indexed.

/usr/lib/tasksel/default_desktop is in tasksel 3.34ubuntu11.

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

The actual contents of the file can be viewed below.

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# Shell library to get the default desktop that tasksel will select 
# for an architecture.
#
# This may be used outside of tasksel (eg, by debian-cd) so should be a
# stable interface.

default_desktop_for_arch() {
	case "$1" in
		i386) echo gnome ;;
		amd64) echo gnome ;;
		# gnome only works on linux,
		# and only on arches with 3d hardware
		# or llvmpipe. See #765839.
		*) echo xfce ;;
	esac
}