You can only load .fla files in Flex, and for that you use the VideoDisplay control.
You can find free converters on the web.
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thank you~but i dont want to convert it throught converter.i just want to load it and display it in my softwear
As reg told before! This is not possible with current versions! Flex - Videodisplay only supports flash movie formats (flv).
I suggest mpeg streamclip ( http://www.squared5.com/ )
Best open source converter of the world!