Tanks a lot for your answer. I have run the instalation file several times. Updated my X-plane 11.32 to the lateste version. But the OverlayEditor still says global apt.data file is invalid.It will not open any airport at all. Even those I have made myself using the program in X-Plane 10. The airports run perfectly well with X-Plane 11x, but not the OverlayEditor. I cannot find any global apt.data file on my pc. Howe can a non existing file be invalid?