Tony,

I don't think you got a response from anyone at Korg that knows.
You say it's your Custom song Books, are you saving them as a SET file?

You could send me one of your songBooks and I can see if it will work for me - it's not a big file. The SET file contains two files - one is the main book and the other is the custom lists.

If you have the optional Micro card installed, you can work directly from that too, if your keyboard is connected to your Pc.

bill G