Windows Help provides a default Help file (called WINHELP.HLP) that explains to users how to use basic Help features. This default file, however, does not include any information about what is displayed in the Help window. In other words, it simply documents the Windows Help application. The default Help file is provided for your convenience so that you can include it with your product if you choose.
To provide users with more specific instructions about how to use your particular Help file, you can create a custom How To Use Help file. This is especially important if you customize Help in ways that make the default Help file inadequate. Or, if you are using the Windows Help application as a delivery medium for nonstandard Help files, you should certainly create a custom Help file that users can read while viewing your information.