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7-Zip is an open source file archiver with the high compression ratio predominantly for the Microsoft Windows operating system. It operates either as a command line program or with a graphical user interface. It also features integration with the Windows shell environment. 7-Zip is free software, developed by Igor Pavlov and distributed under the GNU LGPL license.

The main features of 7-Zip:
• High compression ratio in new 7z format with LZMA compression
• Supported formats:
- Packing / unpacking: 7z, ZIP, GZIP, BZIP2 and TAR
- Unpacking only: RAR, CAB, ISO, ARJ, LZH, CHM, MSI, WIM, Z, CPIO, RPM, DEB and NSIS
• For ZIP and GZIP formats, 7-Zip provides a compression ratio that is 2-10 % better than the ratio provided by PKZip and WinZip
• Strong AES-256 encryption in 7z and ZIP formats
• Self-extracting capability for 7z format
• Integration with Windows Shell
• Powerful File Manager
• Powerful command line version
• Plugin for FAR Manager
• Localizations for 74 languages

 

Changes in 7-Zip 9.00 (April 18, 2009):
- 7-Zip now supports LZMA2 compression method.
- 7-Zip now supports XZ archives.
- 7-Zip now can unpack NTFS, FAT, VHD and MBR archives.
- 7-Zip now can unpack GZip, BZip2, LZMA, XZ and TAR archives from stdin.
- 7-Zip now can open/copy/compress disk images (like \\.\cSmile from \\.\ folder.
- 7-Zip File Manager now doesn't use temp files to open nested archives stored without compression.
- New -scrc switch to calculate total CRC-32 during extracting / testing.
- Some bugs were fixed.

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