I find file native2ascii  in my system under [b] program files/java/jdk6/bin [/b]
I'm not sure if this is file that you mean prof or no but i think problem is in special characters like you said me
I will insert images for my system java in my PC and i mark file by red line for you check if right or wrong and need
Download and I'm search about Utf-8 in java but not found.