This file is indexed.

/etc/X11/Xsession.d/55numlockx is in numlockx 1.2-5.

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

The actual contents of the file can be viewed below.

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# X session startup script: /etc/X11/Xsession.d/55numlockx

# Initial settings
NUMLOCK=auto

# Load configuration
cf=/etc/default/numlockx
[ ! -r $cf ] || . $cf

# Toggle numlock if we're not removed
nlx=/usr/bin/numlockx
[ ! -x $nlx ] || {
    case $NUMLOCK in
        # 'keep' is an undocumented state (see `man 1 numlockx'), though
        # /etc/default/numlockx mentions it; do nothing
        keep)
            return 0
            ;;
        off|on|toggle)
            ;;
        *)
            NUMLOCK=on
            ltd=/usr/sbin/laptop-detect
            [ ! -x $ltd ] || ! $ltd || NUMLOCK=off
            ;;
    esac
    $nlx $NUMLOCK || :
}

# EOF