This is fix for Debian / Ubuntu based distros.
Oryginal module from webmin website dont work with openvpn and openssl from repo. This small fix make it easy usable
Just clone this to webmin/openvpn folder. (webmin is located mostly in /usr/share/webmin)
Oryginal module for webmin: https://www.webmin.com/cgi-bin/search_third.cgi?search=openvpn http://www.openit.it/index.php/it/openvpnadmin