Export Playlist (Not Songs)

Im trying to do something very simple.. Upgrade Some MP3's to WAV.. I thought this would be simple. You see some songs are in playlist (Opening, Lounge, Upbeat, Latin, etc).. And when I purchase WAV versions I need to know which playlist this song is in so I can update the mp3.. 

I can see no way to export the playlist to XML.. XML Export exports the entire collection (but without the playlist)..

Is there an easier way to upgrade some MP3's to WAV and have it reflect in the playlist?