Oke doke, here's the deal. First, you absolutely must COPY that ZT2 entities or ZT2 ES x100_000 folder to wherever you want. NEVER, never operate on anything but a copy (for your own safety). Then, with either WinZip or WinRAR (both free for download) right click on that huge folder you just copied and say "Open With" (use whichever one you downloaded). When the file is open, you will see literally HUNDREDS of files inside (quite daunting! :shocked). Simply tell the program (either WinZip or WinRAR) to Extract the files to wherever you want to work on them. You can use your desktop, a folder in Your Documents, or somewhere else you like to work. The extracting will take a good 5-10 minutes (remember, hundreds of files).
Once it has done that, you will see the entities folder. Inside of that will exist all the other folders/files you will need. I know it sounds like a big deal, and really, it IS. Reason? Because if you mess up the game entities, the game will cease to function. This way, you have an entire entities folder to 'play' with. :happy