Xceed Zip Compression Library - Version 4.5 This high-performance Zip and Unzip data compression library lets your applications create and manipulate 100% PKZip compatible Zip files as well as compress/uncompress streaming data directly in memory. It's designed to offer the ultimate in flexibility while being the easiest to use product of its kind. It includes a state-of-the-art, fully documented ActiveX COM component that provides the industry's most complete feature set and uses the fastest multi-threaded zip compression engine available. Thisproduct sets performance and ease of use standards that other compression libraries aren't even close to achieving.