The OPTIONS HELP FILE instruction defines the name of the message file.
OPTIONS HELP FILE filename
The OPTIONS HELP FILE instruction specifies an expression that returns the filename of a help file. This filename can also include a pathname. Messages in this file can be referenced by number in form-related statements, and are displayed at runtime when the user presses the Help key.
By default, message files are searched in the current directory, then DBPATH / FGLRESOURCEPATH environment variable is scanned to find the file.