A long time ago I used to use a program called Graphic Workshop to convert any image format into any other image format. I haven't used it in a while, so I don't know how good the newest version is, or if there's still a free demo, but here's the link to it:
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syntheid
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Date: 2003-06-07 01:49 pm (UTC)http://www.mindworkshop.com/alchemy/gwspro.html
Hope that helps! ^___^