If you are generating errors within your code and you want to provide additional
help—beyond the Err.Description—for the user, you could have a help file associated
with the error information. The HelpFile property is a string expression that contains the path
and filename of the help file.
The HelpFile property is used in conjunction with the HelpContext property
described in the following section. Together they can be used to provide the user
with optional help when an error message is displayed in a message box.
