If you are using VFP7 (or later) check this:

PRB: HTML Help Does Not Work from VFP Application
http://support.microsoft.com/?scid=314296

If you are using VFP6, you can use the SetUp Wizard, add the Help engine or use the following files:

foxhhelp.exe
hhctrl.ocx
hhw.exe

HTH.

>>Hello,
>>
>>For my applications, I create a CHM compliled HTML help. I also ship the Foxhhelp8.exe (which I place in the application directory) and the foxhhelpps8.dll into common files directory.
>>
>>In the program, I SET HELP TO MyHelp.CHM, but HELP or F1 does not work.
>
>The DLL needs to be registered on target machine.

>Wich DLL?
>Luis Navas