1) The installer for these "codecs" is probably what installs the spyware, not the codec itself. So unless you ran the installer on wine I don't really see how you could install the codecs. And if you did install it on wine, there's no gaurantee the spyware would be able to run on wine and it would be rather strange to see an instance of wine running even after the installer is finished.
2) If the codecs are simply in a zip file and the spyware is embedded in the DLL then the spyware part of the codec will make calls that mplayer's environment will not likely provide it.
A person below your post said that this was the dumbest post ever, sadly he was modded down, but then again, he didn't explain why.