Thanks for Link slayerking, they even have a FREE version and it's very easy to use
However, just tested it out and while it didn't bork at the Japanese characters, the characters have been replaced with a question mark for each of them, so it's not actually worked how I wanted it. The installer for this program relies on the filename having Japanese characters, so it won't install from the DVD.
Looking on the DeepBurner forums it says it doesn't support Unicode, so maybe they mean it will handle Japanese characters, just not burn them correctly! Maybe I should download a Japanese burning program and try that
Burning to a 4x Re-Writable for safety, DeepBurner also says it burned this disc at 6x? The disc was still readable though, maybe a bug with the reported speed!
Thanks also to COdeKing for moving this thread