Before I lock myself out, does file and print sharing need to be installed on the nic for RDP to work properly. If not, why would you have if on a public facing nic?
No. RDP uses TCP port 3389, as such it uses TCP/IP not File & Print Sharing.
You shouldn't need to have it on. If your firewall is configured properly to block SMB it is not a problem at this point in time.