Fantastic! This is just what the native Movie Library was lacking.
However it does not seem to be working for me 
Windows 7 RTM 32bit using Virtual Clone Drive Beta 5.4.3.5 and PowerDVD 9 Build 2010.
I navigate to one of my movies which I know is a Blu-ray rip (ISO) go to More and I then click on MountImage but it just says invalid application.



I then clicked on MountImage again and this time it did say mounted.

However looking in Computer in Explorer the V: drive was not mounted (I changed the Virtual Clone Drive to be V:\ drive in Disk Management).
If I just double click an ISO from Explorer they do mount fine. I am also able to play Blu-ray movies via Media Browser and My Movies and they mount and PowerDVD9 is launched within Media Center OK.
Now MountImage is just saying invalid applicaiton all the time 