I think this is why it's confusing (at least in my mind): If I delete a song from my playlist in my MP3 player it doesn't delete the file but just the entry in the playlist. However, LimeWire's library tab looks like a playlist and it even has a built-in player. Despite this playlist appearance the listing is actually a file manager. Deleting a song from here deletes the file, not playlist behavior. That difference is not very clear.