AlltheWeb supports search by file type.
AlltheWeb支持通过文件类型进行搜索。
Even if the file extension of the ODF document is not correct, you can easily identify the document type by extracting this file.
即使OD f文档的文件扩展名不正确，也可以通过提取这个文件轻松地判断出文档类型。
Every COM API is described by a special file called a type library.
每个COM API都由一个称为类型库的特殊文件进行描述。
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