How can determine OS version is 32bit or 64bit?

My program only can be run windows 2000 or windows xp 32bit, but how can I know my OS is 32bit?

GetVersionEx(..)
is this what you want? :confused:

Cheers

To determine if your 32bit app is running on a 64bit machine, see
http://msdn.microsoft.com/library/de...w64process.asp

- petter