nruddock, I have both and VLC seemed to be able to do it - only nothing happened when I selected save as.. and chose flv.
I haven't tried with VirtualDub though. That might be able to do it. 

Still, it's not really practical that you can't upload a standard Windows video. I admit I'm not sure if Mac/Linux users can see wmv, but I would assume so. And Windows MovieMaker is included in both XP and Vista and is actually a nice program for making animations, so it's a shame it can't be used as is. Plus... Most videos are not exactly enhanced by being transformed into a .flv - quite the opposite...

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.