Show File Name Extensions in Mac OS X

File extensions (like .jpg, .txt, .pdf, etc) make it easy to see what a specific file type format is, but as many Mac users notice, those file extensions are hidden by default in Mac OS X. While hi…

Quick Tip: Managing macOS File Associations

Perform quick actions in the Finder on Mac - Apple Support

Mac Tip: How to show and hide filename extensions

Common Windows file extensions

How to Show Filename Extensions on Mac - iGeeksBlog

How to show filename extensions on a Mac

4 Ways to Change a File Extension - wikiHow

How do I show file extensions in Windows 10?

How to Show or Hide File Extensions on Mac, iPhone, and iPad - MacRumors