ZIP FILE EXTRACTORS
E-books are provided in compressed Zip format. The following unzip utilities will extract/expand the files.

Windows:
WinZip http://www.winzip.com/

Mac:
Stuff It Expander http://www.aladdinsys.com/expander/index.html

Unix / Linux:
Un-Zip http://www.info-zip.org/pub/infozip/UnZip.html