When you need to use older software in windows 8 (or windows 7 and vista) then you probably have seen the message that the help file can not be opened.
This is because the old .hlp file format is no longer supported by microsoft.
The new help files are in html format which does not macht the old windows help system.
If you still need to open the old help files (otherwise you would probably not be here), then you can download and install the old winhelp application.
You can download it from the microsoft download center