You can check if the PROGRAMFILES(X86) environment variable exists. That should at least let you know that it's an x64 bit OS.
(Another trick for Windows 7 is to look for the PUBLIC environment variable).
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In inventory look under OS.Name. My 64bit machines have a ,64bit and my 32 bit machines do not.
Sorry for the delay in coming back to this, but finally got to it.
Thanks for the replies. I like the environment variable better - just in case a language variant doesn't show 64 bit in the OS version string.
Cheers - Paul