#include <windows.h>    

int WINAPI WinMain(HINSTANCE hInstance,
                   HINSTANCE hPrevInstance,
                   LPSTR lpCmdLine,
                   int nShowCmd)
{
    MessageBox(NULL,
               L"Hello World!",
               L"Just another Hello World program!",
               MB_ICONEXCLAMATION | MB_OK);
    return 0;
}