Instead of ripping to VOB files (and the corresponding IFO files), you can use DVD Decrypter's ISO mode to create an ISO image on your hard disk. Then you can use Daemon Tools to mount that image as a ...
PowerDVD expects a full IFO set, I guess. Sounds like you'd pretty much need to run it through a stripper (like IFOEdit) that creates a new (albeit barebones) VIDEO_TS.IFO. Or, you could use a ...