What music player are you using? I've run across the problem of naming files in other alphabets too, and I've found a makeshift solution using iTunes and OpenOffice.

OpenOffice natively supports other language fontsets. iTunes and OpenOffice (well, all Windows programs) support copy-paste. So, what I did was simply write out the track names and other relevant information in OpenOffice using the Insert Symbol thing (it might be called something slightly different) and then copy-pasted them into iTunes. It worked for me! (But I was using Hebrew, not Japanese, so it might be slightly different.)

Still no solution to making it understandable to who don't speak Japanese, though! :)

(PS: Tenor 2, hah!)

Or you can just use Exact Audio Copy. Does fine with portuguese characters (not sure how it does with Japanese......)

Neither support it.

Dunno if you still are doing this but I recommend using GRIP under Linux if you can somehow get it -- does great with any files I have ever ripped in any language (i.e., polish)