Hi henessey,
It works!!!
Very thank to your Great advices and hints!
Now my Yamaha can detect dts from both PowerDVD XP and WinDVD DTS ver. (set SPDIF out!).

The problem is the Sblive! With the update, it can bypass DD, dts and DPL (Dolby Pro Logic). I think without this updates, SBlive will not properly send out these signals (or try modifying them in someway).

Thanks once again!

(AV)PC enthusiatist

FranXis from Hong Kong