bookmark creation is only possible for files that already exists, here I want to create a new file next to the user-selected file, so I can't create a bookmark. I tried to get a document-relative security scoped bookmarks on the parent dierctory but this doesn't seems possible. Do you know anythings else I should try?

I don't want to use NSSavePanel(), if my user is converting 200 files I will not ask my users for 200 confirmation. the output should be located next to the user selected files without the user confirmation. Because I'm only creating files and not overwritting things, I'm not sure why the sandbox is so anoying