ZIP files are files that have been compressed to use smallest amount of memory possible. “Zipped” files are easier and more efficient to download, store, and send over the internet or by email. After downloading, you “unzip” the file to have access to the individual items contained in it. To unzip the file, you need to use WinZIP, an inexpensive Windows utility, or 7-Zip, a free program. If you don’t have WinZip or 7-Zip installed on your computer, go to http://www.winzip.com or http://www.7-zip.org/.