I upgraded my machine to Vista 64-bit and I've almost got Media Center working perfect on it, except I can't find a way to both be able to play MTS file AND get MKV/FLV thumbnails in explorer.Here ...

None16 is a free codec that supports 64-bit processing on a variety of video software packages. Apple’s own QuickTime ‘None’ codec works in 8-bits per channel, which supports 32-bit files.