Alright, here’s how to show or hide file extensions in Windows 10. You’ll notice on my desktop I have a file named Note. I can tell it’s a Word file, but I can’t see the .docx extension. If I really want to see that, I have to enable file extensions in Windows, I’ll show you how to do that.
All you have to do is launch Windows Explorer, and once Explorer appears, all you have to do is locate the tab at the top named View, and then click it. And once you’re in this area, you’ll notice on the right that there’s an option here: File name extensions. It’s really that simple. Click the checkbox, you’re all set. If I go back on the desktop, you’ll see that now it’s docx.
You can of course undo it if you want to hide it, personally I leave it on all the time.