I still had to install the Shark007 codecs to get some of my videos working and I still have some (3GP/3G2) that only play video--no audio--and others (some MOV) that only play audio. I'm 90% happy...
There were so many different video codecs floating around going back a few years before most people standardized on a few key formats, so I'm not surprised that Microsoft won't/can't support everything under the sun. It would just be too hard/expensive.
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