erm.... make the video and publish it in which ever quality you want it as. there should be something in the publish list to make it a .avi and .wma. should be in there somewhere.
EDIT: Kilo beat me 2 it.
Warning - while you were typing a new reply has been posted. You may wish to review your post. LOL
EDIT2: Again: Warning - while you were typing a new reply has been posted. You may wish to review your post. TWICE IN 1 MINUTE