Ever wonder how you can show file extension in Windows 7? (This applies to Vista as well) Now you can toggle to show/off file extension with one keyboard shortcut. Thanks to Hot-To-Geek, you can now show the file extension just like the old days. To do this you need to download a program, get it here. After you’ve install the program, this will auto run at start up, meaning whenever your PC starts this program will run in the background.
With the hot key WINDOWS+Y
You can stop the program running via going to the task manager -> ToggleFileExt.exe -> End Process