Nero 5
select ISO
File Options
and then select "Relax ISO restrictions"
You should be able to have 255 characters in a path...
But this is then only readable in a Windows 9x/NT/2000 environment.
I have not tried this, I often have longer filenames and
Nero pops up a message warning me that it may not be readable in DOS/Win3.1x environment, I always choose to ignore this message and continue burning.