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7-Zip was conceived under open source terms of use being a free file archiver and compression software that works on Microsoft Windows operating systems. It offers a flexible usage, being able to run in command line mode as well as an application with a complete graphical interface. It provides integration with the Windows shell environment and can be used directly from Windows Explorer as simple as right-clicking. Can also be used as a good File Manager or as a plugin for FAR Manager. 7-Zip is a free program, made under the GNU GPL license. Its custom type of compressed archive has a high compression rate (LZMA), offers the possibiliy of creating self-extracting archives and wear the .7z file extension.
There are a whole bunch of formats it can handle: starting with 7z format, ZIP, CAB, RAR and ARJ, as well as GZIP, BZIP2, Z, TAR, CPIO, RPM or DEB.
The ZIP and GZIP files compression ratio is somewhere at 2-10 % better than the ratio supplied by PKZip or WinZip.
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