OCX to compress,uncompress multiples files at same time and subdirectories also, and has the same zip compressionratio , and the files created by this control can be recompressed with Winzip (Niko Mak Computing , Inc.), 9 levels of compression, its a ideal backup utility, and work fine in VB5, Delphi and VC++, sample aplication and install, uninstall feature includeds.