Files that contain the .asx file extension are most commonly associated with the Microsoft's Windows Media Player. These files are Advanced Stream Redirector files, also known as shortcuts.
ASX files contain information about a corresponding media file stream. The ASX file provides the Windows Media Player with information on how to present the associated media file that is contained within the ASX playlist, providing a shortcut to the associated media file. These files can be used to create playlists for the Windows Media Player.
ASX files are also referred to as Windows Media Metafiles and are based on the XML syntax.
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