Hi Franz, sorry no there isn't currently a method for controlling the order that curves will be listed in an exported file. They will just be in the order that they were created in.

There is a Flip command that can be used to flip the direction of an open curve but there isn't a way to display the direction currently:
http://moi3d.com/3.0/docs/moi_command_reference10.htm#flip

- Michael