Large USB sticks are so cheap these days - why not have the same video in two formats?
Name them "Acme presents... for PC.wmv" and "Acme presents... for Mac.mov" - that should support 98% of the audience. The other 2% are going to ask questions what ever you do.
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Alexandre Gollner,
Editor, Zone 2-North West, London
alex4d on twitter, facebook, .wordpress.com + .com