Man lese die Dokumentation richtig:
Zitat:
Returns a value greater than 32 if successful, or an error value that is less than or equal to 32 otherwise. The following table lists the error values. The return value is cast as an HINSTANCE for backward compatibility with 16-bit Windows applications. It is not a true HINSTANCE, however. The only thing that can be done with the returned HINSTANCE is to cast it to an int and compare it with the value 32 or one of the error codes below.
Du wirst wohl das Fenster mit
FindWindow suchen müssen oder
CreateProcess benutzen, dort kannst du in der
STARTUPINFO Struktur größe und Position des Hauptfensters des neuen Prozesses angeben.