dont listen to that guy, you should always secure RDP within a vpn.
as for your question, its in the header in many parts of the forum:
**You ONLY want to use dev tap if you are tunneling layer2 traffic, if you are using IP traffic you want tun. If you are using tap only for windows file sharing, look into running a WINS server instead.
rdp is layer3, use a routed tun.
