Playlist file saved in a plain text format containing the names (and sometimes the physical location) of one or more media files, generally MP3 music files. A compatible media player will then play through the media files in the specified order found in the .M3U play-list file. The .M3U file only contains text and does not contain any media data. The format was originally developed for WinAmp but is now supported by many other media players. These files contain a single header line (#EXTM3U) followed by an entry for each media file.