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 the ...

The Microsoft Outlook program, which is a part of the Microsoft Office software suite, stores email data in archive files with .pst extensions. When you set up an email account in Outlook for the ...

A file extension is a suffix that is added to the end of a file name after a dot. It is usually two to four letters long. File extensions help Windows and other operating systems to know the standard ...