I'm sure there is, but I don't know where to find it. I think they purposely made this difficult to prevent the copying of blu ray discs.
PLAYLIST directory: contains the Database files for Movie PlayLists.
xxxxx.mpls files: store information corresponding to Movie PlayLists. One file is created for each Movie PlayList. The filenames of these files are in the form “xxxxx.mpls”, where “xxxxx” is a 5-digit number corresponding to the Movie PlayList.