What is the format of the word document:
97 - the 2003 version is: .doc
2007 and later versions are ：.docx
Extended information：
The file extension is also called the suffix of the file, which is used by the operating system to identify the file type. a mechanism. Typically, an extension follows the main file name, separated by a delimiter.
doc
Chinese: Document (foreign language abbreviation: DOC, foreign language full name: Document) is a common file extension for computer files, and is also the extension of Word before 2003. Text document. It is docx since Word2007. This format was originally used for plain text files, and is mostly found in the instructions for use of software and hardware in different operating systems.
docx
docx is used by Microsoft Office 2007 and later versions. It replaces its current proprietary default file format with a new XML-based compressed file format. In the traditional The letter "x" is added to the end of the file name extension (i.e. ".docx" replaces ".doc", ".xlsx" replaces ".xls", ".pptx" replaces ".ppt").
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