The file name extensions (formats) used in Flip video are not compatible with Windows Movie Maker. That doesn't mean you can't use it in the software though, but first you will need to convert the file to a format compatible with Windows Movie Maker: .asf, .avi, .dvr-ms, .m1v, .mp2, .mp2v, .mpe, .mpeg, .mpg, .mpv2, .wm, .wmv.
This can be done using 'free to download' software from the internet, though you should obviously be very wary with any program that you download.
There is however a workaround which lets you edit the clips directly on WMM:
- Use the Flip software to create movies (with no added titles/music etc) of the clips you wanted to edit.
- Flip will save these ‘movie’ clips in the movie folder in .wmv format, which can then be edited in Windows Movie Maker.