The extension ASX denotes Advanced Stream Redirector files. These are also known as Windows Media metafiles.
This format was developed on the XML syntax based on Microsoft Corporation and may be ANSI or Unicode (UTF-8) encoded.
The file contains a structure of items that reference specific actions or settings in Windows Media Player. For example, you can pass a list of media files that you want to process in a specific order. Also references to these files are possible.
This is one of the main applications of ASX files. They can be used to refer to files provided on the Internet, for example on web servers. These are then streamed and played using the Windows Media Player.
An ASX file can also contain instructions on how to present the corresponding medium. Also, meta information may be included that will overwrite information contained in the files.
The files can also be used to create playlists for Windows Media Player.