How to unzip multiple folders with FME 2014

I have downloaded 21 zipped folders using the HttpFetcher transformer and I cannot figure out how to get FME to unzip these files.

I've seen some posts about using either the TclCaller or PythonCaller transformer, but I've tried that without luck.

Does anyone out there know how to unzip directories, using FME?

Daníel