How to detect 64-bit in InstallScript

[KrisVanherck]

What's the easiest/most reliable way to detect you are running on a 64-bit OS from InstallScript, is there a function i can call or do i need to go look around in the registry?

[geedunn]

I use the following:

if (SYSINFO.bIsWow64 != 0) then //OS is a 64-bit platform
MessageBox(@ERROR_UNSUPPORTED_OS,SEVERE);
abort;
endif;