All I need to do is to open the .MNY files in a (OEM) version 12 of MS Money, and then export to .QIF files.
Just disable your WIFI/NIC connection, run the export, and then reenable network connectivity.
https://www.youtube.com/watch?v=7p9bnXU6CHs
You could defined a rule in the firewall, but if you only need to run the export once it's easier to just temporarily disable the NIC.
https://www.windowstechit.com/3116/unblock-application-windows-8