Try if you can find any option for 'Rockridge'.
-edit- from Nero's homepage:
'1. Are Romeo or RockRidge formats supported by Nero?
We are sorry to inform you, Nero Burning ROM 5.5x and Nero Express 5.5x and earlier versions only supports the Joliet format, not the Romeo or RockRidge formats.'
Or you could ofcourse switch to an Amiga CDFS which supports Joliet.
