ILOVEYOU

ILOVEYOU, sometimes referred to as Love Bug or Love Letter, was a computer worm that attacked tens of millions of Windows personal computers on and after 5 May 2000 local time in the Philippines when it started spreading as an email message with the subject line “ILOVEYOU” and the attachment “LOVE-LETTER-FOR-YOU.txt.vbs”.

— Wikipedia, ILOVEYOU

This is a formatted version of the ILOVEYOU worm also known as Love Letter. It includes comments which explains the routines that are used by the worm to infect and spread itself.