Well this whole ID stuff is a pain in the donkey. I looked at that IDmap dumps from NEI (I think its that mod) and I'm also capable of comparing .txt files, but not even the names of the blocks and items stayed the same... There must be an easier way. Where is the information for classic that there exists a particular block and why can't Lite use this? (Does your program do something other than changing block IDs, havoc?)