This virus will delete every file with any file extension.
Here's the code:
1)Type that into notepad.
2)Save the file as a ".bat".
As the unsuspecting victim opens the file, his whole hard-drive will be erased.
PLEASE DO NOT ACTUALLY DO THIS. THIS IS FOR EDUCATION ONLY.
DISCLAIMER: I will not be held responsible for the actions of people who read this tutorial. This tutorial is for educational purposes ONLY. And does not in anyway encourage illegal activity.