Thanks to occultist who seems to have found Windows Media Player 9 Final. The build is # is 9.00.00.2980. This appears to be the geniune article and has a Digital Signature dated December 12th 2002
Just as a reminder the public RC is build #2926
"Get more play, your way with Windows Media® Player 9 Series. Get fast and flexible playback with the best audio and video quality for Windows and the Web. Includes special new features optimized for Windows XP".
Download: WMP9 Final (French)
View: Neowin WMP9 Final Thread
News source: Neowin BPN Forum
This should be classed as BETA software!, untill it is confirmed as the real deal ;)