In all versions of Windows including the latest Windows 7, the file extensions are hidden by default. Perhaps it’s because Microsoft did some case study in the past and found that people don’t like being able to see file extensions??? Who knows. All I know is, with hidden file extensions, it’s not easy to (A – Find a file at times and (B – Rename files (specifically their extension.) This is why the below Step-by-Step to configure Windows to display file extensions is one of the first things I do on new systems.
How To Display File Extensions In Windows 7
1. Right-Click the Start Orb, and then Click Open Windows Explorer.
2. In Explorer, Click Organize. Then Click Folder and search options.
3. In the Folder Options window, Click the View tab. Next Click and Uncheck the Hide extensions for known file types check box. Click OK to finish.
Instantly your files will show their extensions at the end of their file name. Now you can even use the Right-Click > Rename feature to change file extensions manually as well (just make sure you know what you’re doing first.)
Speaking of customizing Windows 7, take a look at this How-To for enabling Check Boxes to Select Folders and Files in Windows 7.