To make use of this file(s), locate the help topic of interest and make a note of its context ID.
Then, write a VBA subroutine that displays the topic.
You can attach the subroutine to a button, or provide some other way for the user to execute the sub.
For example, if you'd like to display the help topic that show the Date/Time Functions List,
you'll find that the context ID for that particular topic is 5199659.
The following VBA procedure displays that help topic."
Sub ShowHelp()
Application.Help "XLMAIN" & Val(Application.Version) & ".CHM" ,5199659
End Sub