How do I post a video clip? It states unsupported software...?

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How do I post a video clip? It states unsupported software...?We have a group message site on Yahoo (Siouxland Children with Diabetes) and I can't figure out how to put a small video clip on the site, it's off Microsofts Movie maker, but Yahoo comes back saying unsupported software.
Helpful answer below

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Yahoo doesn't accept MS movie maker file extension. You will have to either convert it to another format like (.avi, .flv, .mpeg) or whatever Yahoo allows.

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