The M3U file format deals with files that store multimedia playlists and is now supported by all major audio players.
M3U files are very similar to plain text files and they contain the location of several files that should be played upon loading the playlist using an audio (or multimedia player). The files' location can be absolute or relative.
M3U players will automatically load these locations and will play the referenced tracks. If a path is invalid, the corresponding file will not be played.
M3U players will also offer their users the option to export their playlists to other formats.