Does anyone where the map info is stored on the DVD? When you open it using ultraiso, is it in the "DB" folder or in the "ntcbus-na***" folder that is in the "tpd" folder? I was thinking that if the new maps were in the "ntcbus..."or "nccbus..." folder, couldn't you just replace the old folder in the high version with the new one from the business or professional version (since the file structure looks pretty much the same) and just make a new DVD that way? TIA.