[racket] un-tarring and un-zipping files?

From: Danny Yoo (dyoo at cs.wpi.edu)
Date: Mon Oct 18 16:25:57 EDT 2010

How do I untar or unzip the files produced by the zip and tar modules?
 I've been staring at:


I can create archives perfectly well: it's the decompression step that
I'm clueless about.

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