In Warlords of Draenor Beta, Blizzard uses the new CASC-file system. Ladik made a program to extract those files, CASC-view. But I can't make it work.

Can someone explain in an easy way how to extract Warlords Beta data-files with CASC-view? I downloaded it from Ladiks CASC-storage site. And then what? I can't open the Data-files using the programs only option: Open Storage. Seems that I should in some way create a storage but I don't understand how. If someone could explain in an easy way I would be very happy.