This file is indexed.

/etc/network/if-down.d/openvpn is in openvpn 2.3.10-1ubuntu2.

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

OPENVPN=/usr/sbin/openvpn
OPENVPN_INIT=/etc/init.d/openvpn
SYSTEMCTL=/bin/systemctl
SYSTEMD=/run/systemd/system

if [ ! -x $OPENVPN ]; then
  exit 0
fi

if [ -n "$IF_OPENVPN" ]; then
  for vpn in $IF_OPENVPN; do
    ## check systemd present
    if [ -d $SYSTEMD ]; then
      $SYSTEMCTL stop openvpn@$vpn
    else
      $OPENVPN_INIT stop $vpn
    fi
  done
fi