Yea I know... but you can still use what I first suggested. the Linksys BEFVP41, it'll put netbios over the tunnel. On the advanced page for the vpn in that device is a check box that says NetBIOS Broadcast, just check it and it'll work. That's the one I have. I forget how much it is, but it isn't cisco/sonicwall prices...
Sorry I'm not familiar with msft vpn but any of their networking hardware I never recommend compared to linksys or dlink.