As I said I understand but if it's a conflict it would be the only way I know to solve it. At least if you temporarily disable third party stuff you would know the problem and could warn people. The clashes don't seem straightforward. Many people say VLC causes this but it works fine for me for example.
My experience is that this is fairly rare and won't affect too many people. You will need to worry about people without 2010 though. 2007 will only play embedded video and mp3 if they have SP2 or 3 and may always fail to play sound which has been faded or trimmed in 2010.
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