In addition to assemblies, every OpenEdge GUI application requires an Assembly References File (assemblies.xml). You must deploy this file in the "At Startup" component to ensure proper execution of your WebClient application.
In exceptional circumstances, your OpenEdge GUI application might use an assemblies.config file. You must deploy this file in the "At Startup" component to ensure proper execution of your WebClient application.
For more information on these files, see the chapter on maintaining user environments in OpenEdge Deployment: Managing ABL Applications.