I found a solution that works fine for me: In terminal type: defaults write com.apple.LaunchServices LSHandlers -array-add \ "<dict><key>LSHandlerContentTag</key> <string>gpx</string><key>LSHandlerContentTagClass</key> <string>public.filename-extension</string><key>LSHandlerRoleAll</key> <string> com.apple.dt.document.gpx </string></dict>" then /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -kill -domain local -domain system -domain user

Problem is not xCode, the problem is MacOS Sequoia!! It is fixed in Sequioa 15.1 Beta 6.