This works, but
If I create a disk this way, it will not save the data, only If I push the save button. So far it's ok. And after a computer restart it not loads the contents of the saved "vdf" file, that's ok too. But how can I load the saved disk data into the previously created disk?
Maybe I'm blind again, but as far as I see there are only two ways to load the saved vdf. First one is to create a new disk from an image file where I have to browse that image. If I do this, then it will tick the "Enable associated image file" and I can't change that.
The second one is to change the properties the existing disk and tick the "Enable associated image file".
But in both cases we return to the original problem.