There is windows media player with WM6 is version 10. TCPMP was written to use the WMP9 codecs, not version 10. Hence the error about the device not supporting these files. I have seen download about this issue (ppcgeeks and on XDA-dev) that has the WMP9 files you need and I believe you just have to copy them into the \windows\ directory and soft reset and everything should be good.....haven't tested on WM6 myself though....
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xv6800 WM6 Kitchen w/3.35 radio
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