No, MPEG2 support don't come with Windows, and never did.
First quality codec for MPEG4 was Microsoft's one. It was hacked by some guys (groups) who generated some different codecs. One became DivX, one became XviD, some of them fall out. But some older files sometimes require that codec to decode the file (I did have once this problem with SMR's codec)
DivX audio is the hacked MP3 decoder from DivX. Some decoders can't handle it and there is no audio. It is bundled in DivX 3.11.
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