RTF2HLP is a popular freeware tool that converts directly a Microsoft?
Word RTF document to a Windows Help file.
The main advantage of RTF2HLP is that it converts documents without the
need of any extra project files.
Writing a help file is simple as this:
1. Write your document using Microsoft? Word.
2. Save it to RTF.
3. Compile it to HLP using RTF2HLP.
http://www.ariacom.com/rtf2hlp/