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 various Doom II-based 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.

Games covered: Doom II games on PC/Mac, Tapwave Zodiac and
Microsoft Xbox.

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

Ledmeister@aol.com