M3U - Wikipedia, the free encyclopedia: "M3U is a computer file format that stores multimedia playlists. It is supported by many applications.
An M3U file is a plain text file that specifies the locations of one or more media files. Each line carries one specification. The specification can be any one of the following:
an absolute local pathname; e.g., C:\My Music\Heavysets.mp3
a local pathname relative to the M3U file location; e.g. Heavysets.mp3
a URL."
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