(In reply to Andreas Stieger from comment #2) > An application does not define itself to be the *default* via it's own > .desktop file. That is up to the desktop environment, and the user's > preferences. So is it a 'first come, first serve' approach then? Why do I see suddenly changes in the default app? e.g., in TW .py files were opened with kate, suddenly with an application called IDLE3. I did not change this...