Just so everyone is clear on how to properly unzip these things for
maximum convenience:

For dos pkunzip the command line should be:
pkunzip world4.zip c:\ -r -p

For winzip, click "extract" then make sure the "RECURSE FOLDER" option is
turned on..

This will allow for the files to be put into their proper directories, so
that the pack is all laid out all nice and purdy-like, just the way I KNOW
you want it.. :)