How To Work With .Zip Files

File Compression & How To Unzip Files:
http://netsquirrel.com/articles/zip.html

How To Unzip Files: Text & VIDEO: (Windows XP):
http://video.about.com/windows/Zip-Files-101.htm

Free Programs: Windows & MAC:
http://www.thefreesite.com/Free_Software/Unzipping_compression_freeware/

How to Unzip a File Using a Mac
http://www.wowscrapbook.com/how-to-unzip-a-file-using-mac.html

And there's always Google.com...