A set of Win32 libraries, DLLs, and controls that let you manipulate tar and gz format archives under Win32.
A DCL user had this to say: Worked very quickly, very reliable, absolutely worth the money, I had it running correctly in 5 minutes, mabye less. There was also more than enough sample code to work with. It’s the best G-zip compression library I have found anywhere..

http://www.innermedia.com/gt/index.htm