>>>Hello!
>>>
>>>via
>>>_screen.icon = "iconX.ico"
>>>
>>>I can easy change the Icon dynamically.
>>>Bud the Taskbar always shows the old Icon.
>>>
>>>Is there a API Call to force the Taskbar to do so?
>>
>>It works over here, both IDE and runtime
>
>Which Windows Version?
>I've Windows 10 1709

IMHO, the ico file must be outside project (EXE/APP)

MartinaJ