my problem is much more complex, that was just an example for testing. The reason of my problem is some kind of corrupt file extension. I want to delete that extension completly, but want to save my settings before. Where are the "Application" settings saved? Looked in the corresponding *.oxr-file in folder FileTypes without success. And when I copy something in the File Type dialog the clipboard contains binary data, right? Not XML like e. g. buttons?