I cannot find the help files in "C:\Program Files (x86)\CDex" on a Windows 7 system.
I did see a post by markinaz from 2010-02-26 that said
"Go to download at http://sourceforge.net/projects/cdexos/files/ and click on View all files, and go to CDex 1.7.0b2 and download the zip file. Take the help file from here and put it into the locate where version 1.7-b4 is stored (C:\Program Files\CDex). Some of the screen shots don't match but the information on how the program works is very good and helps you choose the paramaters for encoding."
I could not find "View all files"