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PLS is a file format developed for storing multimedia playlists containing both audio and video items.
Unlike M3U, PLS include additional details related to the track title and length, besides the items' locations.
As opposed to M3U which is basic text, PLS format is structured like an INI file, and can be easily interpreted by almost any multimedia player.
Just like any other playlist format, PLS files do not contain the real tracks, they only feature their paths (if the files no longer have the same location, they will not be played).