Let me be blunt about this: never open a PIF file, or click on a link to a PIF file, you receive over IM.
Folks, in the year 2005 there is no reason for anyone to be using PIF files for any good purpose. At this point PIF == EVIL. Just say "no". Don’t click that link!
What is a PIF file?
A program information file (PIF) is used to control how DOS applications behave when they are running under windows. You can read all about it here.
Posted by Jeff Wilkes.