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but i know youtube can not accept swf files
Heads up - the last time I uploaded (about a month ago) they also didn't accept .flv, but this may change. Dig around the help on YouTube for accepted formats.
The **best** way to do this: if you actually have Flash, open the source and export the movie in the format you want. In this case, any standard format (.wmv, .mov, .mpg) will work fine for an upload to YouTube.