Has anyone been able to successfully get WMP12 to play any MKV source with x264 encoded video to play? I have a 64-bit Matroska splitter (the one that comes in Shark007's Vista Codec Pack) manually registered on my system. I can open the 64-bit version of WMP12, load the MKV source into the playlist. Only the audio plays. Any advice, other than to install a codec pack? I want to test the native Windows 7 codecs.