GHOSTFAQ.ZIP contains GHOSTFAQ.TXT:

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Ghost-Monster FAQ for Doom II: Hell On Earth

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Updated 12/09/2006.

This document provides general information on a bug that
occasionally surfaces in computer-based Doom II games: The
creation of a "ghost" by an Arch-Vile monster.
If you've ever encountered a monster that walks through
walls and ignores your attacks, then this FAQ is for you.
Find out what ghosts are, what they can and can't do, and
hints on how they can be neutralized.

Updates of GHOSTFAQ are available at:
http://ClassicDOOM.com
Support for console and PC Classic Doom games

Ledmeister@aol.com