Download a viewer from the internet.
请从互联网上下载一个浏览器。
If you can't open the file, you must install a compatible viewer. Viewers capable of opening this file can be found on the internet.
如果您无法打开该文件，您必须安装一个可兼容的浏览器。您可以在互联网上找到可以打开该文件的浏览器。

Attached is the file you requested.
附件是您所需要的文件。
Attached is our latest product catalog.
福建是我们最新的产品目录。
Attached are some files which should help you understand the modification.
福建是一些帮助您理解该变更的文件。