使用这些函数不需要安装，它们是 PHP 核心的一部分。
PHP 的 Windows 版本已内建对此扩展的支持。不需要载入额外的扩展来使用这些函数。
You are responsible for installing support for the various COM objects that you intend to use (such as MS Word); we don't and can't bundle all of those with PHP.