Powerdvd refuses

Changed some associations in the Folder Options/File Types tab. I wanted to make PowerDVD my default player for .MPG and others.
But when i start an mpg for example, it only STARTS PowerDVD, and in the playlist it sais “E:\movie\TheMovie.MPG”

Whats this, how do i fix it?

I use an older version of PowerDVD (5 I think). It often does not auto-play a file, but if I open PowerDVD then direct it to the file it plays fine.