Whats a ZIP archive?
It’s a single compressed file that contains several files inside it. You need a program to create and unpack such files. For unpacking ZIP archives, Aladdin Expander works great. For creating them, we recommend the free Winzip for Windows users; Mac users can use the free MacZip. Current versions of most of the software can be downloaded from the site Bradley University Software Repository at http://www.bradley.edu/software or from the Internet.