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PLS is a file extension that is used for multimedia playlists. Just like M3U format, it only includes references to the location of the audio and video files to be played, but PLS files also feature information about the track title and length.
PLS files are structured like INI files, unlike M3U ones which were plain text files containing the relative or absolute file paths.
PLS files can be easily processed by numerous multimedia players, without requiring any additional software.