Hmmm, my first reply on your request apparently landed somewhere in hey stack on the big internet....
Was there a specific piece of code someone is using from Microsoft? I don't know if missed a message about this.
Jeff Cohen implemented a win32 version of Signals.cpp by using a public available example published on MSDN. Please follow this thread: http://mail.cs.uiuc.edu/pipermail/llvmdev/2004-September/002084.html.