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File Extension - Definition

File Extensions follow the period in a file name and indicate the type of information stored in a file. For example, in the file name Example.txt, the file name extension is .txt, which indicates that the file is a text file. Microsoft Word files have a .doc file extension and Microsoft Excel files have an .xls file extension. Under Microsoft's operating systems, DOS and Windows, some file extensions, including .exe, .com, .bat, and .cmd, indicate that a file is an executable program that can be launched by the user.


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