7-ZIP Archiver is a ZIP compatible file archiver with highest compression ratio. The program is fully integrated to Windows Shell, so all archive operations like extracting, compressing and browsing can be executed using usual Windows Explorer. The program supports ZIP, RAR, GZIP and TAR formats and for ZIP format it provides compression ratio that is 2-10 % better than ratio provided by any other zip compatible compression tools, like PKZip and WinZip. There is also additional powerful command line version of program for backup and other purposes.