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Movie Maker can convert to .avi.
To save as an .avi movie file...
(and several other options)
Type...Ctrl+P to open the Save Movie Wizard /
Choose...My Computer /
Next /
Enter a Name and a Save Location /
Next /
Show More Choices /
Other Settings /
Open the drop window and choose...DV-AVI /
Next /
Wait while the movie is saved /
Finish...