I took the liberty of compiling FamiTracker 0.4.2 for Windows RT. It seems to work decently well, the Surface RT can play things with a 40ms buffer length.
Obviously, this build will not work on Intel Windows machines, only ARM ones. You will need a 'jailbroken' RT device to run this anyhow.
Let me know if any bugs come up. (There shouldn't be any apart from the ones already in the codebase.)
http://cl.ly/0w0l0l3A2u1Z
(Uploaded to CloudApp instead of attaching since apparently 'The file is to big. Max 1024000 kb.')
