It's fixed!
When re-installing wine I tried both wine-stable and wine-development - but in fact you have to use wine-rt - doing that immediately fixed the problem
You will probably have to make sure that you have KxStudio repositories in your apt-setup - I think that some dependencies or similar for wine-rt are pulled from them, I'm not sure. But you can get the repo-information here:
https://kxstudio.linuxaudio.org/Repositories