extract the image with decrypter then see if the vro file is recognised by nero vision as mentioned.This will allow you to re encode the files to vob hopefully
http://www.authoringware.com/vro.htm try this
ok simple possibility change the extension of the vro file to mpg then open this in nero vision apparently the vro will be seen as an mpg (source here
http://www.dvd-guides.com/component/...12847.msg13517 )