I had exactly this problem. In my case, it turned out that I wasn't putting my CHM file in exactly the same path it was in on my development machine. For some reason, VFP compiles the path to the CHM file when it builds the EXE, so the CHM file must be in the same path on the production machine as it was on the development machine.

If this doesn't solve your problem, put a WAIT WINDOW SET("HELP",1) at the start of your app, and see where it thinks the CHM file is on the production machine.

>Problem: HTML Help file will not open on enduser's machine
>
>Background: I created a help file in HTML Help Workshop that was included with Visual Studio 6.0. I set the help path to this help file in my main program to my application. On my machine the help file opens fine and goes right to the topic ID that I specify.
>
>I have made sure to check the HTML Help Engine box on the Application Components step of the Setup Wizard. I have also added the hhupd.exe file from the HTML Help Workshop redist folder, as directed in FoxPro help, as a post setup exectuable to install and register the HTML Help runtime components.
>
>On the enduser machine hhupd.exe runs during the setup without errors. My application also runs without errors. After the help path is set and I call the help file there is no error but the help file does not open. To baffle me further, if I double click on my compiled help file in Windows Explorer, it opens up and works fine on the enduser's machine.
>
>Here's the code that I use:
>
> set help to help\helpfile.chm
> help
>
>Can anyone offer any suggestions?
>
>Thanks in advance,
>Justin