WMV Video Format WMV Format is a video format developed by Microsoft and is designed to handle all types of video content. The files can be highly compressed and can be delivered as a continuous flow of data. WMV files can be of any size and can be compressed to match many different bandwidths (connection speeds). The WMV format is a derivative of the MPEG-4 (Motion Picture Expert Group) format. However, it's more efficient than MPEG-4 in encoding video and, while similar to the ASF format (Microsoft's Advanced Streaming Format), it allows for decreased file size. Using WMV is an excellent way to get file sizes down to reasonable levels while retaining watchable quality.

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