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SWFs should be listed as a supported file type.Or at least get a thumbnail, I suppose.
It's enough NOT to use a thumbnail and make it link directly to the swf (it's pretty much what i did with WEBMs)
On the other hand, we wouldn't want flash files to autoplay (expecially when they're noisy like this one)... So I'd be better to add a button for showing/hiding them.