Select "Link to a file" from the course object dropdown.
Click the "Add object" button.
Click the "Save outline" button.
Click "Edit instance."
Click "Choose file" (or "browse") and select a file.
Type the index file name into the "Index file name" field. By default the server will look for index.html or index.htm. If the file to use has a different name, enter the file name (including extension).