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Is there a Windows API call that will tell me if I’m running on a 64-bit OS? I have some legacy c++ code that makes a call to GetVersionEx to fill in a OSVERSIONINFO structure, but that only tells me (AFAIK) the OS (Vista, V7, etc.), but not the processing architecture. I can hack around this by simply looking for the existence of “C:\Program Files (x86)…”, but this seems ugly. I’m sure there must be an API to return this info.
IsWow64Processmight be what you are looking for.