Scripting CS5 64-bit

I've looked and used the cs5 vbscript reference to automate CS5 from .NET.  I've [succesfully] used CS3 this way in the past, but now with the upgrade to CS5, I'm having all sorts of problems.  First, I had to remove the COM reference in my code, since there was no Adobe Photoshop Type Library registered.  Using the late binding examples (CreateObject("Photoshop.Application"), appears to start working, but I'm getting several unexplained errors, and watching the UI as the automation is running, I'm finding extra documents being opened and documents being closed when I don't expect it.  Is scripting CS5 64bit something that should work, or is this unsupported?