I have never seen an app that shows any kind of file structure. Apps can clearly access the file system, but the file system is never made visible to the user from what I can see. Apple's "it just works" mantra says that users shouldn't have to worry about such complex things as the file system.
Their are plenty of extension scripts for Firefox, Chrome, etc. They don't have direct access to the file system either. You ever asked yourself why? You should do some research, Hixxy. Go look at the following link.
http://developer.apple.com/library/ios/#.../uid/TP40005316I suggest you then look at this also to further explain what Core Data is.
http://developer.apple.com/library/ios/#...gyOverview.htmlWhat does a file system have anything to do with IRC anyhow?
