Update to Visual Basic 6 Add-Ins and 64-Bit Windows

I recently made a post discussing the issues around Add-Ins written using Visual Basic 6 and 64-bit Windows.  I made the mistake of not testing it completely before making that post.  Everything in the original posting is correct but it’s incomplete because I hadn’t thought through the registration process.  I’ve update the original post to add more information to cover registering your Add-In on the 64-bit machine.