Detect whether current Windows version is 32 bit or 64 bit

Question

Believe it or not, my installer is so old that it doesn\'t have an option to detect the 64-bit version of Windows.

Is there a Windows DLL call or (even better) an en

Answer 1

Check the Registry for the existence of HKLM\SOFTWARE\Wow6432Node - If it's there, the system is 64-bit - 32-bit, otherwise.