LoadMenu(hInstance, MAKEINTRESOURCE(IDR_MENU));

or
wc.lpszMenuName = NULL;
.
.
.

LRESULT CALLBACK WndProc ( HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam )
{
static HINSTANCE hInstance;


switch(msg)
{
case WM_CREATE:
hInstance = ((LPCREATESTRUCT) lParam)-> hInstance;
LoadMenu =(hInstance, MAKEINTRESOURCE(IDR_MENU));
return 0;

case WM_CLOSE:
DestroyWindow(hwnd);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc (hwnd, msg, wParam, lParam);
}
return