What about the corresponding File formats for Windows Movie Maker Windows Vista?

Please refer to the following contents
  

 
Windows Movie Maker supports the following file formats.

■Readable File Formats in Windows Movie Maker

You can import files with the following file name extensions into Windows Movie Maker to use in your project. You can also import files into Windows Movie Maker that have a different extension from the ones listed above, but not all file types will work when you try to use them to make a movie.
File Format Expanded Name
Video files ASF / AVI / DVR-MS / M1V / MP2 / MP2V / MPE / MPEG / MPG / MPV2 / WM / WMV
Audio files AIF / AIFC / AIFF / ASF / AU / MP2 / MP3 / MPA / SND / WAV / WMA
Picture files BMP / DIB / EMF / GIF / JFIF / JPE / JPEG / JPG / PNG / TIF / TIFF / WMF

■Savable File Formats
File Format Expanded Name
Video files of  DV/AVI  format AVI
Windows Media Video files  WMV

For the method of saving edited project to the Media, please refer to the following relative solution.
[Windows Vista]Import files into Media by  Windows Movie Maker