Wmv and avi Won't play on new iMac

I used to be able to play wmv and avi on my old G4. I can't play either now. Technically an avi file will open and play on Real Player, but as it "plays" is has neither images nor sound. wmv won't play at all. When I try to open them in Quicktime I get a message that they're not movie files. I downloaded and installed applications called DivX and 3ivx, which apparently are supposed to play wmv or allow Quicktime to play them, but so far they don't.
When I try to drag a wmv file to the DivX converter, I get an error message with that says "The movie could not be converted. It contains no recognizable movie. (-2048). This happens with both new wmv files I download on my iMac, and old ones I transferred from my G4.d
When I drag an avi file to DivX, it says it has converted it, but then it "plays" the way it did on Real Player, with neither image nor sound.
Well it just "converted" an old wmv from 2001, and now it's "playing" without image or sound!
Well I THOUGHT I'd downloaded 3ivx, but it installs a 3ivx folder in my Applications file that doesn't contain the 3ivx application so far as I can tell. The two applications are Get 3ivx! and Uninstall 3ivx.
Can anyone help me out here?

Ok, with the AVI files that say "The movie could not be opened. The file is not a movie file." I can't do do that. With the file that gives me sound but not image, it says that the format is Indeo 3 (Perian). One that plays but has neither sound nor image says the same thing. Another that plays with neither sound nor image says IV31. Does that mean anything to you? Thanks.
I don't actually know what a codec is either.

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