Is it really necessary to use Wine for all this? If there is a native version (Linux-version) of mplayer available, why use Wine? Wine can often be troublesome, since it doesn't automatically "just work" with every available Windows app.
According to what I've been able to find out just by googling around a bit, there should be no need to use Wine for coreavc with mplayer on Linux:
http://code.google.com/p/coreavc-for...erInstallation
Also, what type of files are your trying to play? A player like VLC or Totem might be able to play your files without any problems.
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