Have you tried Magic SWF 2 AVI converter? I used it a while back in an attempt to convert some Star Wars fan films to avi, which I was then going to convert to DVD. Never got it finished though. I can't remember exactly, but I think in some cases I could only convert the video with that. I then had to use an audio recorder to capture the audio and resync everything later. It actually wasn't that hard, just a little annoying.