You can mark a solution to be only runnable by a specific client type. Just activate the solution in Developer and select the active solution node in the Solution Explorer. In the Properties pane you will find the 'solutionType' property, set that to NG client only. That's all. Now you can export the solution and it won't show up for Smart and Web-client.
Hope this helps.
Robert Ivens SAN Developer / Servoy Valued Professional / Servoy Certified Developer