>>>I found this article: http://berezniker.com/content/pages/visual-foxpro/how-detect-64-bit-os
>>>
>>>It says you can "indirectly" determine if the OS is 64-bit by using the OS() method, but it does not says specifically how to do it. I looked at the help file about that method, but I do not see what params to use.
>>>
>>>Can someone tell me the exact way to do it with the OS() method?
>>>
>>>(I do not want to use the other technique he showed.)
>>
>>Check http://fox.wikis.com/wc.dll?Wiki~VFPFunctionOS but I also don't see a simple way. I tried various combinations of OS on my Windows Vista 64 and it simply returns 'Windows 6' for me.
>
>Mine says: 'Windows 6.01'

What you're using? I'm using Windows Vista 64 and I see Windows 6.00 as OS(1).