7-Zip:- creates 7z format archives, with a .7z file extension. Each archive can contain multiple directories and files. As a container format, security or size reduction are achieved using a stacked combination of filters. These can consist of pre-processors, compression algorithms, and encryption filters.
The core .7z compression uses a variety of algorithms, the most common of which are bzip2, LZMA2, and LZMA. Developed by Igor Pavlov, LZMA is a relatively new system, making its debut as part of the 7z format. LZMA consists of a large LZ-based sliding dictionary up to 4 GiB in size, backed by a range coder.
The native 7z file format is open and modular. All filenames are stored as Unicode.
7zip Supported formats:-7-Zip supports a number of other compression, and non-compression, archive formats including:
Packing/unpacking of ZIP, gzip, bzip2, tar and, in betas for version 9, xz.
Unpacking only: Microsoft cabinet (CAB) files, RAR, MSLZ, SWF, FLV ARJ, Z, LHA, cpio, smzip, JAR, ISO CD/DVD images (7Zip version 4.42 and up), DMG, HFS, rpm and Debian deb archives.
According to the 7-zip website, since version 4
.65 (from 2009-02-03), 7-zip can unpack the following formats in addition to the formats it fully supports: ARJ, CAB, CHM, CPIO, DEB, DMG, HFS, ISO, LZH, LZMA, MSI, NSIS, RAR, RPM, UDF, WIM, XAR and Z. (Full pack and unpack support is provided for the following formats: 7z, ZIP, GZIP, BZIP2 and TAR).
7-Zip is able to open some MSI files, allowing access to the meta-files within along with the main contents. Some Microsoft CAB (LZX compression) and NSIS (LZMA) installer formats can be opened, meaning that 7-Zip can be used to check if a binary file is an archive. Similarly, some executable programs (.EXE's) may be opened as archives and have their contents extracted by 7-zip.
When compressing ZIP or gzip files, 7-Zip uses a home-brewed DEFLATE encoder which is often able to achieve higher compression levels than the more common DEFLATE implementation of zlib, at the expense of compression speed. The 7-Zip deflate encoder implementation is available separately as part of the AdvanceCOMP suite of tools.
The core .7z compression uses a variety of algorithms, the most common of which are bzip2, LZMA2, and LZMA. Developed by Igor Pavlov, LZMA is a relatively new system, making its debut as part of the 7z format. LZMA consists of a large LZ-based sliding dictionary up to 4 GiB in size, backed by a range coder.
The native 7z file format is open and modular. All filenames are stored as Unicode.
7zip Supported formats:-7-Zip supports a number of other compression, and non-compression, archive formats including:
Packing/unpacking of ZIP, gzip, bzip2, tar and, in betas for version 9, xz.
Unpacking only: Microsoft cabinet (CAB) files, RAR, MSLZ, SWF, FLV ARJ, Z, LHA, cpio, smzip, JAR, ISO CD/DVD images (7Zip version 4.42 and up), DMG, HFS, rpm and Debian deb archives.
According to the 7-zip website, since version 4
.65 (from 2009-02-03), 7-zip can unpack the following formats in addition to the formats it fully supports: ARJ, CAB, CHM, CPIO, DEB, DMG, HFS, ISO, LZH, LZMA, MSI, NSIS, RAR, RPM, UDF, WIM, XAR and Z. (Full pack and unpack support is provided for the following formats: 7z, ZIP, GZIP, BZIP2 and TAR).
When compressing ZIP or gzip files, 7-Zip uses a home-brewed DEFLATE encoder which is often able to achieve higher compression levels than the more common DEFLATE implementation of zlib, at the expense of compression speed. The 7-Zip deflate encoder implementation is available separately as part of the AdvanceCOMP suite of tools.
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