There have been many questions on Exporting for Flash playback on the Web. This Adobe ARTICLE might provide some useful tips, and help in the understanding of the various format.
Hope that this helps,
Because different Adobe NLE's (Non Linear Editors) handle Flash material differently, and some not much at all, one likely source of additional Flash handling would be Moyea. They have several Flash programs, and even offer a Flash Importer for PrPro (prior to CS4). Unfortunately, they do not yet have a plug-in Importer for PrE.