Thanks for the help with the investigation, Jay! I did the exact same thing as you did, exploring the package installer with Pacifist.

Andrew - yes I did rebuild in the styles picker dialog.

Investigating a bit further, by googling on some of the Style names, I found most of them listed in the Bonus 49-PAK 2017:

https://www.pgmusic.com/forums/ubbthreads.php?ubb=showflat&Number=380029

I conclude they are just mis-classified in the StylePicker dialog, they should be presented as coming from the BonusPak set instead?

The missing _JWLTZAS.STY is still puzzling, though. But I think I might come over it, and start sleeping well in the nights again. :-)

Best regards
/Björn