LIBCD.lib(crt0.obj) : error LNK2001: Nichtaufgeloestes externes Symbol _main
Debug/HelloWindows.exe : fatal error LNK1120: 1 unaufgeloeste externe Verweise
Fehler beim Ausführen von link.exe.

Was mache ich da falsch? Danke.

// ----------------------------------------------------------------------------
// DEFINES --------------------------------------------------------------------

#define WINDOW_CLASS_NAME "Game Shell Window"
#define WIN32_LEAN_AND_MEAN  

// INCLUDES ------------------------------------------------------------------

#include <windows.h>  

// MACROS ---------------------------------------------------------------------

#define KEYDOWN(vk_code) ((GetAsyncKeyState(vk_code) & 0x8000) ? 1 : 0)
#define KEYUP(vk_code)   ((GetAsyncKeyState(vk_code) & 0x8000) ? 0 : 1)

// GLOBALS --------------------------------------------------------------------

HWND      main_window_handle = NULL; 
HINSTANCE hinstance_app      = NULL; 

// Funktionsprototypen für den Spielablauf ------------------------------------

void Game_Shutdown(void);
void Game_Init(void);
void Game_Main(void);

// Funktionsdefinitionen ----------------------------------------------------

LRESULT CALLBACK WindowProc(HWND hwnd, 
						    UINT msg, 
                            WPARAM wparam, 
                            LPARAM lparam)
{

    PAINTSTRUCT		ps;		
    HDC				hdc;	

    // Nachrichtenverarbeitung
    switch(msg)
	{       
	    case WM_CREATE: 
        {
		    return(0);
		} 
        break;

	    case WM_PAINT: 
		{		   
   	        hdc = BeginPaint(hwnd,&ps);	           
            EndPaint(hwnd,&ps);          
		    return(0);
   		}
        break;

	    case WM_DESTROY: 
		{		   
		    PostQuitMessage(0);          
		    return(0);
		} 
        break;

	    default:
        break;

    } 
    return (DefWindowProc(hwnd, msg, wparam, lparam));

} 

// ----------------------------------------------------------------------------

int WINAPI WinMain(	HINSTANCE hinstance,
					HINSTANCE hprevinstance,
					LPSTR lpcmdline,
					int ncmdshow)
{

    WNDCLASSEX winclass; 
    HWND	   hwnd;	 
    MSG		   msg;		 

    // Fenstereigenschaften festlegen:
    winclass.cbSize         = sizeof(WNDCLASSEX);
    winclass.style			= CS_HREDRAW | CS_VREDRAW ;   
    winclass.lpfnWndProc	= WindowProc;
    winclass.cbClsExtra		= 0;
    winclass.cbWndExtra		= 0;
    winclass.hInstance		= hinstance;
    winclass.hIcon			= LoadIcon(NULL, IDI_APPLICATION);
    winclass.hCursor		= LoadCursor(NULL, IDC_ARROW); 
    winclass.hbrBackground	= (HBRUSH)GetStockObject(BLACK_BRUSH);
    winclass.lpszMenuName	= NULL;
    winclass.lpszClassName	= WINDOW_CLASS_NAME;
    winclass.hIconSm        = LoadIcon(NULL, IDI_APPLICATION);

    hinstance_app = hinstance;

    if (!RegisterClassEx(&winclass))
	    return(0);

    if (!(hwnd = CreateWindowEx(NULL,                 
                                WINDOW_CLASS_NAME,     
						        "My Game Shell",
						        WS_OVERLAPPEDWINDOW | WS_VISIBLE ,                                
					 	        0,0,	  
						        800,600,  
						        NULL,	  
						        NULL,	  
						        hinstance,
						        NULL)))	
    return(0);

    main_window_handle = hwnd;

    Game_Init();

    // Nachrichtenweiterleitung
    while(TRUE)
	{

	    if (PeekMessage(&msg,NULL,0,0,PM_REMOVE))
	    { 
	        if (msg.message == WM_QUIT)
               break;

            TranslateMessage(&msg);	       
	        DispatchMessage(&msg);
	    } 
        Game_Main();       
    } 

    Game_Shutdown();

    return(msg.wParam);

} 

// ----------------------------------------------------------------------------

void Game_Init(void)
{} 

// ----------------------------------------------------------------------------

void Game_Main(void)
{
    // Mit ESC kann die Anwendung verlassen werden
    if (KEYDOWN(VK_ESCAPE))
       SendMessage(main_window_handle,WM_CLOSE,0,0);
} 

// ----------------------------------------------------------------------------

void Game_Shutdown(void)
{}

Ich weis aber nicht ob das was Bringt

Gruß,
DC