Have you ever looked at the default help files AfxCore.rtf and AfxPrint.rtf provided by MFC for those projects created by the AppWizard? They're a mess! If you have to edit these manually (like I do) then they are very hard to understand. Which brings us to what these files are about. I basically got down and dirty and stripped out all the garbage tages etc that are not needed. The amount of repetition in the files was extreme.
The new files are laid out better and much easier to understand. They should be drop in replacements for the existing files assuming you have not chnaged them yourself.
Not much to this article, but if you have to manually edit the core RTF files, these will make it much easier