Jon, someday I may document all this. Meanwhile, you can access startup.int etc from the Xy command line with ca b:startup.int The path to the editor folder in Xy is b:\xy4u2 and in the Mac finder, Ctrl-click on the app, choose Show Package Contents; open the Contents folder, and you’ll see ’Shortcut to BDrive.’ You can use that or navigate by hand to Contents->Resources->Files->BDrive, where you wlll find the folders. Incidentally, looking in the app just now, I saw that it still uses separate executables for ARM and Intel machines. I’ve made a single executable for the DOSBox-X app, and will update this system to match, possibly next week. I don’t have any answer about the DOSBox-X app, unfortunately.