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Video files that use digital rights management (DRM) can't be used in Movie Maker.
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Support for using MPEG‑2 and Microsoft Recorded TV Show video files in your movie is available only if your computer is running one of the following editions of Windows: Windows 7 Home Premium, Windows 7 Professional, Windows 7 Enterprise, or Windows 7 Ultimate, Windows Vista Home Premium, or Windows Vista Ultimate.
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AVCHD video files that contain Dolby Digital audio can be used in Movie Maker if your computer is running one of the following editions of Windows: Windows 7 Home Premium, Windows 7 Professional, Windows 7 Enterprise, or Windows 7 Ultimate.
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MPEG‑4 video files that contain AAC audio can be used if you're using Movie Maker on a computer running Windows 7.
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3GPP and 3GPP2 video files that are often recorded on a mobile phone can be used in Movie Maker if the file contains MPEG‑4 video, AAC audio, and if Movie Maker is installed on a computer running Windows 7.
3GPP video files might contain AMR audio and 3GPP2 files might contain AMR or QCELP audio instead. In these cases, the video will often play, but the audio won't. Files that contain H.263 video might not play in Movie Maker without installing additional codecs.
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Some MPEG‑4 video files can be used when you're using Movie Maker on a computer running Windows Vista if the necessary audio and video codecs are installed.
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For more information about video and audio codecs, as well as determining which codecs are installed on your computer and used in a particular video file, see
Codecs: frequently asked questions on the Windows website.