Precompiled Header Files
STDAFX.CPP, STDAFX.H
These files are used to build a precompiled header file PROJNAME.PCH and a precompiled types file STDAFX.OBJ. It is important that you neither define nor undefine any of the _AFX_NO_XXX macros in stdafx.h. See the Knowledge Base article "PRB: Problems Occur When Defining _AFX_NO_XXX". You can find Knowledge Base articles on the MSDN Library CD, or at http://www.microsoft.com/kb/.