Hello,

what is #pragma once
what is #if !defined(AFX_STDAFX_H__535D0A00_A86C_40E5_BD32_76476085E127__INCLUDED_)
#define AFX_STDAFX_H__535D0A00_A86C_40E5_BD32_76476085E127__INCLUDED_

what's #define WIN32_LEAN_AND_MEAN


Thanks for any help,