Depends on your set up. Are there other ways to get to the files on you server other than FTP? Are there any generic FTP users that may have permissions to the file? Test it, go off-site and try to get that file, ask a computer savvy friend try to get it. However, if the permission on the file is “no read, write, or execute”, they should not be able to get it. They may be able to see that the file exists, but it will be locked from any actions. They shouldn’t be able to download it, since they can’t ‘read’ the file. Hope that maybe answers your question. If you want, I can test it from here if you give me your permission/want me to. Best of luck