The browser will accept it as an unknown file type and then prompt the user to open it based on the registered program for that file extension.

该浏览器将接受它作为一个未知的文件类型，然后提示用户根据注册的程序为文件扩展名打开它。

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The type library is not necessarily registered in the system but is contained in a file.

类型库不一定在系统中注册，但包含在文件中。

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