Odin wrote you:
... Try if you can find any option for 'Rockridge'.
I just checked and Nero 6 doesn't support Rockridge either. There is support for "relaxed" Joliet filename support (64 characters instead of 8+3 or 31). Maybe your program would support the 31 standard. Otherwise I'd go with his other suggestion and change your Amiga software. Like it or not, Commodore didn't often go with the winners when selecting standards; i.e., Intellifonts.
HB