让PHP访问64位操作系统中的32位COM对象

I've recently upgraded my old home server system to a 64-bit system (Win 7) and have a problem in accessing a 32-bit home automation DCOM object in PHP. I'm running 32-bit Apache, and so far as I'm aware, 32-bit PHP (I don't think there's a 64-bit version available). The only difference between this setup and my old (but working) setup, is that I'm running the 64-bit Windows 7 rather than 32-bit.I've recently upgraded my old home server syste