I can't play them on PDVD 10 "Ultra." PDVD shuts down like I just robbed Fort Knot and wants to pretend like it doesn't know me/hates me. However, Windows 7 Media Player is totally respectful of my honesty and my association with CyberLink & the work of film artists. I think I've almost paid CyberLink as much as Microsoft at this point. It's really ironic in a tragedy/fail by CyberLink kind of way.