First of all, file extensions are letters that allow u to know what type of a file it is. It could be either a document, plain text, music, and etc. There are so many out there, that it is really hard to count them all out. The way to show your file extensions on your Windows 7 computer is, first select Organize on a folder, then click on Folder and Search Options. Then click on the View tab on the pop up. Finally, deselect the box with hide extensions for file known types. Picture from: www.webdevelopersnotes.com

Difficulty Level: Easy