I have written a pak editor that uses the same structure as Harry Hunt's, to compile the application you need delphi 7 and Jvcl component set, but the zip also contains the exe and a package.

The source code is a bit of a mess, i havnt really had much time to clear it yet. And their is still a few problems i need to sort out with in it!

The zip is 2.04mb : http://www.biocoders.org/kPak.zip

I hope it helps.