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Moving Picture Experts Group Audio Layer 3 Uniform Resource Locator or MP3 URL or simply M3U is a simple computer file format. Its main purpose is to store multimedia playlists. It first came out as an implementation in Winamp. It was then that the following applications supported its use up to this day. An M3U file is just a plain text file that contains the location of each media files saved in a play list. It then tells the media player what song to play when and which file will follow. The locations can be absolute or relative path names. M3U is also commonly used for creating a play list which contains data that points to a stream in the Web. In that way, the M3U provides an easier way of accessing that stream.