I don't think LW is normally into sharing playlist files. What you'd need to do is direct LW to the original files. A playlist is simply a reference file that points to where the songs are but doesn't actually contain the songs. Also I think LW's media player could be limited as to the playlists it can utilise.

Just a suggestion & make of it as you will, but how about iTunes which will give you the choice of sharing songs of an artist or album since it organises songs that way. For an example see: Albumwrap/iTunes By the way iTunes can open & import LW's media player's playlists & songs.