Show File Extensions in Windows

One of the most annoying things that Vista and Windows 7 does by default is hide file extensions (unless you have ultimate or professional). File extensions show you what type a file is, which is really important, especially when you have two files with the same name.

Here's a folder that has some photos in it. I saved the photo of the basket as .bmp so I could send it to someone. But since there's no extension, they're indistinguishable. How the hell am I supposed to tell the two apart?!?!

To show extensions, go to control panel, and click on folder options. Click the view tab and uncheck "Hide extensions for known file types"

Now, when I go back, I can finally tell which one is the .bmp file and which is .jpg