Also, if you don't mind downloading a small program, there is also "Convert":
http://joshmadison.net/software/convert/
I have been using Convert for several years and never had a problem with it or a conversion it could not do. It is small, doesn't need an install program, just sits there on my desktop for when I need it, I just close it down when I am finished. Clean and slick.
Regards,
David
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