There are 2 ways to open HyperNext projects
Projects are usually in the Documents folder, folder HyperNext Examples, folder Creator projects
1- the usual way is to use the Menu "Open" option on the File menu and navigate to the project, then select the project which is highlighted in the dialog box.
2 - the other way is to go into a project folder and double-click the project icon which should run HyperNext Creator and cause it to load the project automatically.