Hello Mr Morgan,
Sorry for the reply delayed.
Sothink SWF to Video Converter can convert a flash frame by frame, since it do have frame by frame and interactive option.
Referring to the format tht Windows Movie Maker can edit, sorry for that I am not sure about the format Windows Movie Maker support. Or you can check the supported formats of Sothink SWF to Video Converter here:
Convert SWF to AVI/MPEG video.
Convert SWF to iPod movie (MP4).
Convert SWF to 3G video (3GPP/3GPP2).
Convert SWF to PSP movie (MP4).
Convert SWF to animated GIF.
Convert SWF to BMP/PNG/GIF/JPEG images series.
Hope that helps and have a nice day.