"Zipping" was invented by PKWare, Inc., and the most popular program for unzipping is called PKUNZIP. You can click here to go to PKWare's home page, and download the latest complete PKZIP and PKUNZIP programs.
Note that "Zipping" and the .ZIP extension have nothing to do with zip codes. (PKWare changed the name from ARChiving to ZIPping about the same time I was writing ZIPKEY -- I groaned when I saw that, because I knew people would confuse my product with theirs!)
After you have downloaded one of my packages, you should create a new subdirectory on your hard drive, move the .ZIP file there, make the directory the current directory, and invoke PKUNZIP or PCUNZIP to unpack the files. Here is a sequence of commands you can type to your DOS command prompt, to do this for ZIPKEY, assuming you have PKUNZIP, you have figured out where the ZIPKEY.ZIP file is on your hard drive, and you made that the current directory with the CHDIR command:
mkdir \ZIPKEY copy zipkey.zip \zipkey del zipkey.zip chdir \zipkey pkunzip zipkey.zip
If you wish to avoid that extra message in the future, you might want to explore the configuration options of your Web Browser software. Most browsers allow you to specify that files with the extension .ZIP are to be automatically saved to disk, and are not intended to generate any kind of screen display.