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Video format based on MPEG-4 video standard with certain modifications. 3ivX can be compared pretty easily to DivX ;-) format, but in this comparision 3ivX unfortunately loses in quality (at least currently, 10/2001).
3ivX is pretty popular format among Apple MacIntosh users, because of its extensive support for Mac. In other hand, Windows users have stayed away from this format because in its original format, 3ivX had to be stored in QuickTime file structure instead of AVI file structure -- most of the Windows-based video editing tools don't support QuickTime, but either AVI or ASF instead.