How do you use Virtual clone

How do you mount a movie to Virtual clone

Originally posted by HAMP

How do you mount a movie to Virtual clone
Just an example :

My Computor > Virtual CloneDrive icon > right-click > Virtual CloneDrive > Mount > VTS_01_1

Or double-click on the .ISO/.DVD file.

I thought it was that simple but it does not work for me. I have tried it both ways before asking. Not sure what I am missing?