Anyone have WinUser.h used for the SendMessage function?

Does anyone have a copy of the WinUser.h file that contains the Windows API 
constants that are used for the SendMessage function? 

If so, can you please send this to me as an attachment? Or, perhaps tell me 
where I can find it? I've found about ten WinUser.h files associated with 
various MS SDK's, and none of them seem to apply.

Thanks a million,

Bryan

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