a computer program for managing and manipulating archive zip files of a computer . the program includes a system and method for opening , creating , and modifying , and extracting zip archive files . the program is fully integrated into microsoft windows explorer and is accessed via explorer menus , toolbars , and / or drag and drop operations . an important feature of the program is the archive manager which may be used to open a zip file , create a new zip file , extract zip files , modify zip files , etc . the program is integrated into microsoft windows explorer using the shell name space extension application program interface developed by microsoft .