Once upon a time, when I had created .scn file in XCode i could edit this file in nice 3D editor. Today I can see only big file icon instead of 3D view. Is something changed? Or my Xcode is somehow broken?
I have deleted permanently Godot and restarted computer.
In Xcode's project navigator you should be able to right-click on the scn file and then select the desired editor (Open As → SceneKit Document).