You'll find out in time that after a while, newer versions of some programs or codecs or anything else in world, won't be any more compatible with the older ones. They call it evolution. Or "buy the new one, the older isn't good any more".
FFDshow is a filter for decoding MPEG4 files (and not only) such as DivX, XviD and others. It is under continuous developpment (updated often) and sometimes keep compatibility with older filters, but not as much as DIvX and XviD. Usualy, FFDshow has more problems in playing older files than the official codecs.
To find out wich exact codec is used to compress a file use utilities {like gspot or virtualdub). Truth may not be what you think.
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