Blog post at the Adobe site on 27 June 2018 by Peleus Uhley https://blogs.adobe.com/security/2018/06/new-flash-player-security-controls.html More about mms.cfg in the Flash Player Administration Guide https://www.adobe.com/devnet/flashplayer/articles/flash_player_admin_guide.html
Thank you for sharing. This is quite interesting actually, although it would be better if it came 10 years sooner. This new mms.cfg file has quite a large amount of security related options. Anyone that still has to use Flash on specific machines should have a look at the PDF document that is linked in the blog above and have a look at chapter 4 specifically. I'm still going over it at the moment.
You're most welcome, WildByDesign ! Let us know how it goes, if you want. Years ago I used that config file mms.cfg on a previous PC but currently I don't. It's time I look again at it (ough...) (but for now I don't have the time).