2008/9 disc update
Twice tonight I tried the loading.kwi file removal "trick" on a new, 2008/9 North America disc. I made two plastic coasters... Bad news, apparently the trick no longer works. The modified disc will load w/o errors and maps will show, but all destination input buttons (Address, Point of Interest, Intersection, etc.) become unresponsive when you push them to enter a new destination. I get the feeling the loading.kwi file on this latest map data disc may also contain new instructions on where to find database files on the disc, and/or the db file names have been changed so the original, 1791-friendly loading.kwi is no longer able to locate them.
It appears the 2007/8 disc may be the end of the line for those of us who may still be using the 1791 bypass and wishing to upgrade to the latest map disc. But, I hope I am wrong and something went haywire during the DVD burning process, although it always worked like a charm in the past so I am not too optimistic. And there is always a chance the loading.kwi file on this new disc may leave the 1791 bypass code alone, but I don't want to take the chance if it doesn't. Hopefully someone else here is able to try this and confirm whether I am right or (hopefully) wrong.