I thought that was going to work for a while..but no joy.
After right clicking'open with I was able to eventually navigate to the .exe file. Now when I choose open with PDVD is finally a choice, so that's good. After opening the file PDVD prompted that it was not the default, I clicked set as default, this took me to the settings page once again and I thought it would now show.. no such luck, and just double clicking files open the stock viewer.
Thanks for your time