uTorrent 3.5.5 Build 45966
See http://www.sb-innovation.de/showthread.php?p=349640 if you need to run Extreme Mod and the real uTorrent at the same time, but note such a setup is unsupported and discouraged.
Note: do not enable "protocol enhancements"! That changes the peer_id prefix, and this emulation assumes the default one.