I want to create an UWP App, that consumes plugins.
While it sounds promising,
Is this observation correct, or did I miss something.
Like commenters already said, what I searched was not available in the standard Windows API.
I had also no luck in finding some Framework what would already had done what I needed.
In the end I wrote something myself: Not AppExtension, not AppService but AppPlugin (using both Extensions and Service).
It is not perfect but enough for my purposes.
Thank you for the comments (especially for the video)