Problem updating help file

I had a VB program which was developed using VB3.0 for Windows 3.1. Now I am upgrading this program using VB6.0 for Windows 95. I need to update the help file of this program to incorporate the changes. Is there a way I can do
it easily by using the old help (.hlp) file without rewriting the content
of the whole help file once again.

I have tried using Help workshop. But it asks for some project files (.hjp). I don't see any .hjp file in my old program, though I do see the .hlp file and this help file does run even in my new program. My program is making use of WinHelp.

Please Help