LONG WINAPI CMyWindow::WndProc(HWND hwnd, UINT Message, WPARAM wparam, LPARAM lparam)
{
	switch(Message)
	{
		case WM_DESTROY:
			PostQuitMessage(0);
		break;

		case WM_COMMAND:
			switch(wparam)
			{
				case IDR_BTN_LOAD_FILE:
				//вот тут надо открыть OpenFileDialog	
				break;
			}
		break;

		default:
			return DefWindowProc(hwnd, Message, wparam, lparam);
	}
	return 0;
}