64 bit or 32 bit OS using WMI?

How do I determine if the currently running Operating System is 32 bit or 64 bit?
I thought I could use the OSArchitecture member of the Win32_OperatingSystem Class, but this member isn't available on Windows 2003 - my code will run on XP and above (Primarily Server 2003).
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FLPeopleAuthor Commented:
What namespace is that class in?
This article also helps:

I believe it is in the root WMI namespace.
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