What Is A File Extension?

A file extension, or filename extension, is a suffix at the end of a computer file.

Easy] How to Change File Extension in Windows 10 - EaseUS

File Types

10 Types of File Extensions and How to Use Each One - Invigilo LLC

Common file name extensions in Windows - Microsoft Support

Common Windows file extensions

How to change a File Extension in Windows – FlexRadio

How to show File Extensions in Windows 11/10

Your Guide to Excel File Extensions

What are File Extensions and why are they important?

Extensions of Excel Types of File Formats ( XLS, XLSX, XLSM, XLSB )

The Giant List of Document File Types and Extensions

Can't see File Extension in Windows Explorer - CAD International

What is a file extension?