What Is a File Extension & Why Are They Important?

A file extension or suffix is the group of characters, usually 3-4 in length, after the period in a full file name. Also called a filename extension.

EXEfiles.com - Some Important WINDOWS system File Extensions Windows are .DLL .SYS .EXE and .DAT (Designed by Freepik from flaticon.com) #FileTypes

File EXTENSION: HOW IT IS IMPORTANT?

What are file extensions, and why are they important? - Quora

What is a file extension? Why does it matter? – Cowirrie Commentary

Tax Tip: Tax Reminders for October 15 Extension Filers - TAS

File Extension - an overview

How to show File Extensions in Windows 11/10

How to make a file which has two different extensions in one directory - Quora

Common file name extensions in Windows - Microsoft Support