Windows 8.1 comes with a built-in antivirus protection software called Windows Defender. It provides basic protection and according to Microsoft, it is good enough for many users. If you need to check some file or folder, for example, files on a removable drive, you should launch the Windows Defender app using the Control Panel and customize the scan options. This is not handy and takes too many clicks. In this article we will see how to add it directly to the File Explorer right click context menu, so you will be able to scan for files with just a right click.