Ok, then I did understand your correctly in the first place. A clean VS 6 installation uses the Windows SDK that comes with VC 98, so in my case, it uses the file at "%Program Files (x86)%\Microsoft Visual Studio\VC98\Include\WINBASE.H". It looks like your VS 6 is set to use the SDK in "%Program Files (x86)%\Microsoft SDK". Offhand I'm not sure why VS 6 IDE sees a different SDK than VS 2010 with v60, but this is what you need to explore.
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