[0PiX0]

My guess is that you are sending a string to the server, not the lines.
Perhaps something like this will work for you:

PHP Code:

function onActionServerSide(afi, svar1, svar2) {
  switch (afi) {
    case "callTextTypeFile":
      temp.text_type_file.loadLines(svar1);
      triggerClient("gui", name, "displayTextTypeFile", temp.text_type_file);
    break;
    case "editTextTypeFile":
      temp.text_type_file.saveLines(svar2, 0);
    break;
  }
}

//#CLIENTSIDE

function sendLinesToServer() {
  temp.lines = MyGuiMultiLineTextControl.getlines();
  triggerServer("gui", name, "editTextTypeFile", temp.lines, "MyFile.txt");
}