>A *.chm file opens with the command %systemroot%\hh.exe %1
>On my Windows 2000 machine this is in C:\Winnt\. An open file call should >launch it with no problem. You can also place hh.exe in a folder and do a >RUN command pointing to "hh.exe some_location\myhelp.chm"

This works OK. But I'm wondering why on my machine it is not necessary. For example, the code I use is:
set help to myhelp.chm
set help on
help

Why doesn't this work on the client's machine?