In certain unusual cases, standard C runtime libraries that ExtendSim expects to find may be missing from your Windows operating system. In that case you will get the error message api-ms-crt-runtime dll is missing from the computer when you try to launch ExtendSim. In this case you need to update your Windows operating system with the Universal C Runtime (CRT) component. See Microsoft support for information.

In an ActiveX/COM client/server process, if a Client app tries to launch ExtendSim as a Server, you might get the error message Run-time error 429: ActiveX component can’t create object. This occurs when the operating system restricts ExtendSim from registering as an OLE/COM server. So ExtendSim can register itself as an OLE/COM server to interface with Excel and other apps, right-click the ExtendSim application and choose Run as Administrator.