Be specific, what 5.1 audio format are you trying to play? If WMV 5.1 is an audio format, then you need a decoder that will handle that, I haven't bothered to read about it but that information should be available. I am assuming the DVD's you are playing are DTS and Dolby Digital which can be handled over the optical or coaxial digital audio connection. If your VC-1 encoded 1080p video doesn't have either of those audio codecs, it is no wonder it isn't being decoded by the same decoder that is able to decode the 5.1 audio from DVD.
Chris
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