First, users open a document.

首先，打开一个文档。

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Users can open and save documents more easily if the document type has a file extension and a file type ID.

如果文档类型有文件扩展名和文件类型ID，则用户可以更容易地打开和保存文档。

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Users can, for example, write or edit a document on one device, put that device to sleep, open the same document on another device, and pick up where they left off, right down to the cursor position.

FORBES: The Battle For The Clouds