Xceed Zip Compression Library is a high-performance Zip & Unzip data compression library. It lets your applications create and manipulate 100% PKZip 2.04g and 4.5 compatible Zip files and compress/uncompress data directly in memory. Offers maximum flexibility and is the easiest to use product of its kind. State-of-the-art, clearly documented ActiveX component that provides the industry's most complete feature set and the fastest multi-threaded compression engine.