This file is indexed.

/lib/crda/setregdomain is in crda 1.1.2-1ubuntu2.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh

set -e

REGDOMAIN=
CRDA_CONF=/etc/default/crda

[ -r "$CRDA_CONF" ] && . "$CRDA_CONF"
[ -z "$REGDOMAIN" ] && exit 0

# In the future, iw may be moved to / filesystem
[ -x /sbin/iw ] && exec /sbin/iw reg set "$REGDOMAIN"

# Wait for /usr, it may not be mounted yet
(
	. /lib/udev/hotplug.functions
	wait_for_file /usr/sbin/iw
	exec /usr/sbin/iw reg set "$REGDOMAIN"
) &