said 1 year, 3 months ago:
The best method I found for uploading Flash content to youtube is using Flash to save a .avi movie file. Use Adobe Media Converter to convert that into .fla. Youtube will accept .fla.
There are free.swf to wmv converters. You want to be careful as some do not convert animations well, such as layer masks and motion tweens. And other free software will sometimes watermark the entire video.
Good luck to you.