I have used Kevin Boylan's VCLZIP in D3 without any issues for a no. of years
http://vclzip.bizland.com/v2src.htm
or
http://members.xoom.com/boylank/v2src.htm
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Phil Scadden, Institute of Geological and Nuclear Sciences
PO Box 30368, Lower Hutt, New Zealand
Ph +64 4 5704821, fax +64 4 5704603
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New Zealand Delphi Users group - Delphi List - [EMAIL PROTECTED]
Website: http://www.delphi.org.nz