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.

Excel cannot open the file because the file format or file extension is not valid. Verify that the file has not been corrupted and that the file extension matches the format of

What Is a File Extension & Why Are They Important?

How do I get the file extension (e.g. .docx) to appear in the Title - Microsoft Community

File Extension

What is the purpose of a file extension in Windows? - Quora

Common file name extensions in Windows - Microsoft Support

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

Important File Extensions – Er.Pradeep Singh Rathore

File Extensions -- What Are They? Why Are They Important??

What does a .locky file extension mean? Ransomware! • Graham Cluley

What are File Extensions and why are they important?