Yeah, thought so (sorry if my English is bad).
Then I have a screen with 4 possibilities.
1) Set your default program: looks like it, but Powerdvd ain't shown there
2) Associate a file type or ... :Ok, maybe this. But which file type is used when I double-klick the dvd in "my computer"
3) Change autoplay: This is used when I insert a dvd in my computer (so this ain't it, I guess)
4) Set program access and computer defaults: If it's here, I can't find it. (custom: media player -> doesn't show Powerdvd in the list)