Dimiter 'malkia' Stanev wrote: > Oh, man... what a mess are the Windows SDK's. Anyway, I've dropped the check on PROCESSOR_ARCHITECTURE. And I'm now checking for either CPU or TARGET_CPU. Thank you for the research! > WDK 7.1 (Windows XP x86 Free Build Environment) > CPU=[AMD64] > TARGET_CPU=[] > PROCESSOR_ARCHITECTURE=[AMD64] Can't properly detect that one, though. Anyway, the WDK (DDK) is not very high on my support list. --Mike