The file extension of a WORD document is DOC or DOCX. DOC is Office 2003 and previous versions, and DOCX is Office 2007 and later versions. The way to view the file extension of a WORD document is as follows:
1. First, find the word document you want to view on your computer.
#2. Select this document, then right-click the mouse and select the Properties option in the menu bar.
#3. Switch to the general page in the properties window, find the file type in the general page, and you can see the document extension after the file type.
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