Saving Data for the iPhone App?

Question

Does anyone know how I can save and store and retrieve data after the iPhone application has been closed?
High Scores, Names.....

Answer 1

This seems to create and store  a  .txt on the iphone and I am able to grab the data
   var file:File = File.applicationStorageDirectory;
    var filestream:FileStream = new FileStream();
    var appDataTemp:String;
    file = file.resolvePath("appData.txt");
    filestream.open(file, FileMode.UPDATE);
    filestream.writeUTF("test");
    filestream.close();
    filestream.open(file, FileMode.UPDATE);
    appDataTemp = filestream.readUTF();
    filestream.close();
    filestream.open(file, FileMode.UPDATE);
    MovieClip(root).testtest.text = filestream.readUTF();
    filestream.close();
but after 2 days I can't get any further. For example this works in the air mobile tester, but doesn't on the iPhone. I am completly stumped.
    var file:File = File.applicationStorageDirectory;
    var filestream:FileStream = new FileStream();
    var appDataTemp:String; 
    file = file.resolvePath("appData.txt");
    filestream.open(file, FileMode.UPDATE);
    appDataTemp = filestream.readUTF();
    filestream.close();
    filestream.open(file, FileMode.WRITE);
    filestream.writeUTF("test" + appDataTemp);
    filestream.close();
    filestream.open(file, FileMode.UPDATE);
    appDataTemp = filestream.readUTF();
    filestream.close();
    filestream.open(file, FileMode.WRITE);
    filestream.writeUTF("test" + appDataTemp);
    filestream.close();
    filestream.open(file, FileMode.UPDATE);
    MovieClip(root).testtest.text = filestream.readUTF();
    filestream.close();