OpenPlsInWMP allow you to play Shoutcast Playlists (PLS files) in Windows Media Player 9/10. SHOUTcast is Nullsoft Free Winamp-based distributed streaming audio system.
Thousands of broadcasters around the world are waiting for you to tune in and listen.
The installer associates Shoutcast Playlist (PLS) files with OpenPLSInWMP.exe, which digs through the PLS file for the MP3 server info and then starts up Windows Media Player with that stream.
It shows up in the Add / Remove Programs list so you can uninstall it easily. The end result is that Windows Media Player plays PLS files!