KENSSharp is a cross-platform compression and decompression library by FraGag written in C# for the .NET Framework 3.5 Client Profile and later. It is a port of KENS, based on the design of the C++ port by flamewing. A front-end GUI application is also provided to compress and decompress individual files. Also included is a Windows shell extension.

See forum: http://forums.sonicretro.org/index.php?showtopic=24573