Is there a free application for Windows to extract the sound from an SWF file into WAV?
I tried opening the file in VLC 1.1.11, but it just crashed, and 2.0 is pretty recent so I'd rather wait.
You could use Vixy to record and convert it straight off the net, if you remember where you got that flash file from.
You could try AoA Audio Extractor as it is made to rip audio from FLV (Flash Video) files.
You could install Audacity and then just use it to record the audio output of your computer, as you play the SWF file from the net.
As to the SWF file crashing when you play it with VLC... well, it could be crashing to the file being corrupt. Go back to the source and start again.