Registers an inteface type to the firewall rule. Extensibility point in the WiX XML Schema. Schema extensions can register additional elements at this point in the schema. A interface type to which the firewall rule applices. See [Interfaces](https://learn.microsoft.com/en-us/windows/win32/api/netfw/nf-netfw-inetfwrule-get_interfaces) for examples. Extensibility point in the WiX XML Schema. Schema extensions can register additional attributes at this point in the schema.