If you are using OS X, you would open Terminal, use the cd command ( cd directoryname )to navigate to the folder where your zipped file is, and enter the command I gave; underneath the pretty GUI, OS X is good old UNIX.

 

More information on Terminal...

http://macapper.com/2007/03/08/the-terminal-an-introduction/

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The Wisdom of bagginsbill:

"Oh - the manual says that? I have never read the manual - this must be why."
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