~cpp 
#include <windows.h>
#include "resource.h"

HINSTANCE hInst;
LPCSTR szWindowClass = "API Window Class";

ATOM MyRegisterClass(HINSTANCE hInstance);
BOOL InitInstance(HINSTANCE, int);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK About(HWND, UINT, WPARAM, LPARAM);

int APIENTRY WinMain(HINSTANCE hInstance,
		 HINSTANCE hPrevInstance,
		 LPSTR lpCmdLine,
		 int nCmdShow)
{
	MSG msg;

	MyRegisterClass(hInstance);

	if (!InitInstance (hInstance, nCmdShow)) 
	{
		return FALSE;
	}

	while (GetMessage(&msg, NULL, 0, 0)) 
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}

	return msg.wParam;
}

ATOM MyRegisterClass(HINSTANCE hInstance)
{
	WNDCLASSEX wcex;

	wcex.cbSize = sizeof(WNDCLASSEX); 

	wcex.style = CS_HREDRAW | CS_VREDRAW;
	wcex.lpfnWndProc = (WNDPROC)WndProc;
	wcex.cbClsExtra = 0;
	wcex.cbWndExtra = 0;
	wcex.hInstance = hInstance;
	wcex.hIcon = NULL;
	wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
	wcex.hbrBackground	 = (HBRUSH)GetStockObject(WHITE_BRUSH);
	wcex.lpszMenuName	= (LPCSTR)IDC_API;
	wcex.lpszClassName	 = szWindowClass;
	wcex.hIconSm = NULL;

	return RegisterClassEx(&wcex);
}

BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
   HWND hWnd;

   hInst = hInstance;

   hWnd = CreateWindow(szWindowClass, "API", WS_OVERLAPPEDWINDOW,
           CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
	  NULL, NULL, hInstance, NULL);

   if (!hWnd)
   {
      return FALSE;
   }

   ShowWindow(hWnd, nCmdShow);
   UpdateWindow(hWnd);

   return TRUE;
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	int wmId, wmEvent;

	switch (message) 
	{
		case WM_COMMAND:
			wmId    = LOWORD(wParam); 
			wmEvent = HIWORD(wParam); 

			switch (wmId)
			{
				case IDM_NEW:
				case IDM_OPEN:
				case IDM_SAVE:
				case IDM_SAVEAS:
				   MessageBox(hWnd, "Not support", "API", MB_ICONERROR | MB_OK);
				   break;
				case IDM_ABOUT:
				   DialogBox(hInst, (LPCTSTR)IDD_ABOUTBOX, hWnd, (DLGPROC)About);
				   break;
				case IDM_EXIT:
				   DestroyWindow(hWnd);
				   break;
				default:
				   return DefWindowProc(hWnd, message, wParam, lParam);
			}
			break;
		case WM_DESTROY:
			PostQuitMessage(0);
			break;
		default:
			return DefWindowProc(hWnd, message, wParam, lParam);
         }
         return 0;
}

LRESULT CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
	switch (message)
	{
		case WM_INITDIALOG:
				return TRUE;

		case WM_COMMAND:
			if (LOWORD(wParam) == IDOK)
			{
				EndDialog(hDlg, LOWORD(wParam));
				return TRUE;
			}
		         break;
         }
         return FALSE;
}

~cpp 
//Microsoft Developer Studio generated resource script.
//
#include "resource.h"

#define APSTUDIO_READONLY_SYMBOLS
/////////////////////////////////////////////////////////////////////////////
//
// Generated from the TEXTINCLUDE 2 resource.
//
#include "afxres.h"

/////////////////////////////////////////////////////////////////////////////
#undef APSTUDIO_READONLY_SYMBOLS

/////////////////////////////////////////////////////////////////////////////
// Korean resources

#if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_KOR)
#ifdef _WIN32
LANGUAGE LANG_KOREAN, SUBLANG_DEFAULT
#pragma code_page(949)
#endif //_WIN32

#ifdef APSTUDIO_INVOKED
/////////////////////////////////////////////////////////////////////////////
//
// TEXTINCLUDE
//

1 TEXTINCLUDE DISCARDABLE 
BEGIN
    "resource.h"
END

2 TEXTINCLUDE DISCARDABLE 
BEGIN
    "#include ""afxres.h""rn"
    ""
END

3 TEXTINCLUDE DISCARDABLE 
BEGIN
    "rn"
    ""
END

#endif    // APSTUDIO_INVOKED


/////////////////////////////////////////////////////////////////////////////
//
// Menu
//

IDC_API MENU DISCARDABLE 
BEGIN
    POPUP "File"
    BEGIN
        MENUITEM "New",                         IDM_NEW
        MENUITEM "Open",                        IDM_OPEN
        MENUITEM "Save",                        IDM_SAVE
        MENUITEM "Save As",                     IDM_SAVEAS
        MENUITEM SEPARATOR
        MENUITEM "Exit",                        IDM_EXIT
    END
    POPUP "Help"
    BEGIN
        MENUITEM "About",                       IDM_ABOUT
    END
END


/////////////////////////////////////////////////////////////////////////////
//
// Dialog
//

IDD_ABOUTBOX DIALOG DISCARDABLE  0, 0, 182, 63
STYLE DS_MODALFRAME | WS_POPUP | WS_CAPTION | WS_SYSMENU
CAPTION "About"
FONT 10, "System"
BEGIN
    DEFPUSHBUTTON   "OK",IDOK,116,38,50,12
    LTEXT           "API Windows Applicationnfor Development in Windows Seminar",
                    IDC_STATIC,16,14,149,17
END


/////////////////////////////////////////////////////////////////////////////
//
// DESIGNINFO
//

#ifdef APSTUDIO_INVOKED
GUIDELINES DESIGNINFO DISCARDABLE 
BEGIN
    IDD_ABOUTBOX, DIALOG
    BEGIN
        LEFTMARGIN, 7
        RIGHTMARGIN, 175
        TOPMARGIN, 7
        BOTTOMMARGIN, 56
    END
END
#endif    // APSTUDIO_INVOKED

#endif    // Korean resources
/////////////////////////////////////////////////////////////////////////////



#ifndef APSTUDIO_INVOKED
/////////////////////////////////////////////////////////////////////////////
//
// Generated from the TEXTINCLUDE 3 resource.
//


/////////////////////////////////////////////////////////////////////////////
#endif    // not APSTUDIO_INVOKED

~cpp 
//{{NO_DEPENDENCIES}}
// Microsoft Developer Studio generated include file.
// Used by API.rc
//
#define IDC_API                         101
#define IDD_ABOUTBOX                    102
#define IDM_ABOUT                       40001
#define IDM_NEW                         40002
#define IDM_OPEN                        40003
#define IDM_SAVE                        40004
#define IDM_SAVEAS                      40005
#define IDM_EXIT                        40006

// Next default values for new objects
// 
#ifdef APSTUDIO_INVOKED
#ifndef APSTUDIO_READONLY_SYMBOLS
#define _APS_NEXT_RESOURCE_VALUE        103
#define _APS_NEXT_COMMAND_VALUE         40007
#define _APS_NEXT_CONTROL_VALUE         1000
#define _APS_NEXT_SYMED_VALUE           101
#endif
#endif