The mp4 issue with windows is only a problem with old winXP machines, and they are unfortunately still plentiful in the corporate world :-( I normally always render both mp4 and wmv just to be sure, it just is anther output module anyway so quite easy on my end.
But there is another annoying wmv issue you have to be aware of, when you render a wmv to a server (atleast our servers) there is some wrong flags being written to the file. The "NumberOfFrames" is set to 0, and even if Windows 7 plays the file fine, WinXP wont play it. If you render to a local disk the "NumberOfFrames" is written with the correct value and every version of windows plays it fine. This is ofcourse with the stanard Media Player since that is what most clients use.
download mediainfo to check the file for issues:
wmv does seem to being on the way out, since even Microsoft looks to be promoting mp4 instead now, and there has not been any new versions of wmv in years. I think i saw something about microsoft dropping support for windows XP next year, so soon everybody might need to upgrade to a more current version in the corporate world also :-)
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