Hmm.. Undelphix is only a good choice when you are allready using it in your game/application.
You could try this one:
http://www.delphizip.org/
Or this one:
http://www.dellapasqua.com/delphizlib/
Or check a few of these:
http://www.torry.net/pages.php?s=99
Hope this helps.
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