Function DialogBoxParamW 

pub unsafe fn DialogBoxParamW<P1>(
    hinstance: Option<HINSTANCE>,
    lptemplatename: P1,
    hwndparent: Option<HWND>,
    lpdialogfunc: DLGPROC,
    dwinitparam: LPARAM,
) -> isize
where
    P1: Param<PCWSTR>,