I need to be able to save the tree data to a file and reload it at some time in the future - probably with a newer version of the app that will be using a newer version of your UltraTree control.

Is your binary file layout flexible enough to allow loading a file that was saved using a different [older] version of the control. (I am talking only about the latest  .Net assembly - I will not have any data that was saved by the old COM control)

If the Binary format will not work, what about the XML format.
(I would prefer to use Binary as it is half the size.)

Thanks
Mike