Where the Windows Firewall Group Policy settings are stored

One of the many non-ADMX-based sections of the Group Policy editor is Windows Firewall, under Security Settings in Computer Configuration. These settings are actually stored in the POL file, though, and therefore appear in the policies section of the computer's Registry. Specifically, all policy-defined rules (including Connection Security Rules), are stored here:

HKLM\SOFTWARE\Policies\Microsoft\WindowsFirewall