Hi Keith.
In the B2 universe, a Playlist is a TEXT file containing a list of pointer to the music that the B2 holds
This function (in the USB menu) exports this text file of the selected Playlist
While the Function ringed in Red (in the Playlist menu) exports the music files associated with the specified Playlist.
There is also a way of exporting the TEXT files of all the playlists this is ringed in Yellow.
Hope this helps
Fred