Application Help File dialog box
Go Up to Application Appearance
Project > Options > Application > Appearance > Browse
Enables you to browse directories and to select a file to be the default help file in your application.
By default, the Application Help File dialog box shows only files with the .hlp extension. To specify other types of help files, select the Any file (*.*) type in the Files of type control. Then you can select help files of the .CHM, .HTML, and other types.