Show File Extensions in Windows 7

Windows 7 hides file extensions information by default.

To see the file extension, please follow the following steps.

1. Click the Start button (or, press the Windows key on keyboard).
2. Type folder options in the Search Box. Hit Enter.
3. Choose the View tab. Scroll down until you see the option Hide extensions for known file types.
4. Uncheck it, and hit OK.

Now you can see file extensions for all your files.