Windows Movie Maker, a multimedia application bundled with Windows Vista, Windows XP and Windows Me, supports a variety of video and audio formats. Windows Movie Maker doesn’t include native support for these formats out of the box, but it can download codec updates allowing the program to open and save additional formats. Windows Movie Maker can install the required codecs automatically when you open a video file that requires them, although this feature is disabled by default. Writer Bio

How to Update Windows Movie Maker Codecs - 34