The commandline instruction to run a playlist used to be (didn't test it now):
bsplayer.exe "playlist.bsl" [options]
(depending from where you start it "bsplayer" could have to be full path and name of bsplayer.exe; this is also valid for the playlistfile)
In fact also simply "running" the playlist.bsl file should do the trick as well (on the understanding that the file-extension .bsl is properly associated with BSPlayer).
Maybe I didn't understand your question correctly and it would be a good idea to have a look
here (and/or perhaps also
here).
