3ivX is an MPEG-4 ASP codec, just like DivX and Xvid.
That simply means that you don't need the 3ivX codec, because for example ffdshow is also able to decode the video.
The DivX and Xvid decoders can also decode video encoded by 3ivX. It may be needed to change the FourCC. But it is very well possible that they are able to recognize the FourCCs used by 3ivX, when turning on their respective "Generic MPEG-4" decoding options.
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