There's the following note in the VDPAU readme docs:
"VC-1 support in NVIDIA's VDPAU implementation currently requires GeForce
9300 GS, GeForce 9200M GS, GeForce 9300M GS, or GeForce 9300M GS."
Given that those particular cards are pretty uncommon, chances are that you won't yet have WMV support
Driver 180.06 has a lot of problems playing anything but the samples, particularly mkv files. I highly recommend moving to 180.08 (
ftp://download.nvidia.com/XFree86/Linux-x86/180.08/) which seems to have fixed some of the issues
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