A file extension, or file name extension, is the letters immediately shown after the last period in a file name. For example, the file extension.txt has an extension of .txt. This extension allows ...

Now click the icon showing the dog-eared page with the Excel logo on it. The code & [File] should appear. Now click OK. The file name will appear in the header when you print the file.

Make sure the box for File Name Extensions is checked. Once file name extensions are enabled, navigate to where the Excel file is stored. Right-click on the file and choose Rename from the context ...

Also known as a Comma Separated Value file, a comma delimited file is a standard file type that a number of different data-manipulation programs can read and understand, including Microsoft Excel.