I just got the Fatal1ty X-fi card and it was a total drag to find out that it doesnt support Dolby Digital and DTS signals on Vista (im running x64) on their latest driver release 2.15.0002 - 50% of the reasons I bough this card for are because of such features!
Going through Creative's Knowledge base I found this on a X-Fi - Vista related FAQ:
Q: Will decoding of Dolby Digital and DTS signals be supported in the future? If not, why not?
A:These functions are not supported at driver level in Windows Vista and going forward will be supported at application level by applications such as Power DVD or WinDVD.
Does anybody know what this means? Does anybody know if PowerDVD or WinDVD offer any Dolby/DTS support for the card yet?
Thanks for the follow ups
P.S. The sound quality difference from Vista to XP is pretty big. I notice that XP is much better sounding and the sounds on Vista seem a bit muffled. Both sound good, but XP is a ton better.