Can't be done. Old Terragen allowed  .lwo export as I recall, but as these are actually part of a planet the become less or actually non exportable....sorry. If you made your terrain originally in Old Terragen and use it in TG2 then you could export it from OldTerragen  for use in both apps if you are thinking of doing comparisons.. ...

 

Once in a while I look around,
I see a sound
and try to write it down
Sometimes they come out very soft
Tinkling light sound
The Sun comes up again