My issues might even be better solved with FSActivateOptionSyntax, but I don't know where to find the docs for it. Or how to propably use it. Yeah, that's probably meant to be used for your situation. I think you're supposed to be able to provide a path then you can get a security-scoped URL that you can use to access that specific path while sandboxed. I briefly looked at that a while ago but I don't think most of the Info.plist keys are documented right now. Most of the documentation right now is just scouring the forums or Apple's open-source FSKit extensions for examples (or, if you're lucky, replies to your feedbacks), which isn't too great. My (untested, could be wrong) assumption was that if you were to set something like shortOptions abc:d: Then on the command line you'd be able to pass options like -a or -b, while -c=arg and -d=arg both take additional arguments. I never needed it for my own extension though so I didn't look too hard, but the forums post you listed suggests that the ability to get a