PowerDVD/WinDVD -> uses Multi channel MME
Winamp -> uses WDM/directx/MME
I was going to find out what the differences are since I have to wire both WDM and MME to the ASIO in the Directwire of the Prodigy.
Here's a good read too
http://www.thuneau.com/forum/viewtopic.php?t=79