[kh99]

Well, the ability to create a file will depend on how the server permissions are set of course. You may have your set up to allow creation of a file anywhere whereas someone else doesn't (really you probably shouldn't allow it in the same directories that your php scripts are in, but I'm not a server config expert or anything). Maybe what you want to do is have an option to specify a directory, then instruct the admin to enter a path that has create permission for whatever user the web server runs as.