Bios Magazine posted a review on Corel WinDVD 9 Plus Blu-Ray

Whereas some might prefer the traditional interface and stability of Cyberlink's PowerDVD, WinDVD 9 Plus Blu-ray is definitely the reigning champ. Having said that it's not without its faults. Most noticeable is that you can't select WinDVD 9 for playing only some video and audio file formats, as it does not use file associations. This means you can't designate it as your default player for MPEG-2 HD and use something else for MOV and WAV files. Still, while it's not entirely perfect, Corel has a winner on its hands - at least until the next release of PowerDVD.

Corel WinDVD 9 Plus Blu-Ray Review