This thread may merit a flood of one-word "no" answers and that's fine - I have no real knowledge of the specifics of the situation other than the basic relations between powers at the time. That said, Napoleon seemed to have no issue truncating Prussia for the benefit of his German allies, Saxony particularly, so I have to wonder (and ask) if Austria was a bit more pro-Napoleon and a bit more committed to the Austro-French alliance, could they have regained Silesia or part of Silesia?