Playlists are files that contain information on which files to play. Usually they are plain text files with paths to the files to play. Here an example in the M3U format:
rock.mp3 classical.mp3 OTHER\new.mp3 \\COMPUTERNAME\Music\Band\Artistname - Track - Title of the Song.mp3 http://www.webaddress. com/.../movie clip.mp4 http://111.22.333.44:8024
This file would instruct the player to first play the file rock.mp3, then classical.mp3 and then the file new.mp3 which is in the directory OTHER before accessing a song on the local network. Then it plays a movie clip in MP4 format from the web and lastly switches to a web radio station.