I've retried that. When I want to add my volume, it says, that this is not a valid volume:
https://dl.dropbox.com/u/200751/boxcryptor/2013-01-14_21h01_55.png
My volume content:
https://dl.dropbox.com/u/200751/boxcryptor/2013-01-14_21h02_40.png
The .xml is outsourced. But it looks like, that the wizard expects an configuration beforce I could specify it?!