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7-Zip is a free and open-source file archiver, a utility used to place groups of files within compressed containers known as "archives". It is developed by Igor Pavlov and was first released in 1999. [2] 7-Zip has its own archive format called 7z introduced in 2001, [12] but can read and write several others.
7z is a compressed archive file format that supports several different data compression, encryption and pre-processing algorithms. The 7z format initially appeared as implemented by the 7-Zip archiver. The 7-Zip program is publicly available under the terms of the GNU Lesser General Public License.
In version 4.5 of the specification (which is not the same as v4.5 of any particular tool), PKWARE introduced the "ZIP64" format extensions to get around these limitations, increasing the limits to 16 EB (2 64 bytes). In essence, it uses a "normal" central directory entry for a file, followed by an optional "zip64" directory entry, which has ...
A library format used primarily on the Commodore 64 and 128 lines of computers. This bears no resemblance to the DOS LBR format. While library files were quick to implement (a number of programs exist to work with them) they are crippled in that they cannot grow with use: once a file has been created it cannot be amended (files added, changed ...
Latest release version Latest release date Status License Cost 7-Zip: Igor Pavlov 1999-01-02 Cross-platform 24.09 [1] 2024-11-29 Active LGPL-2.1-or-later (RAR plugin is proprietary) No cost ALZip: ESTsoft: 1999 [a] Cross-platform 12.22 [2] 2024-02-07 Active Proprietary No cost [b] Archive Manager (File Roller) Paolo Bacchilega 2001-05-12 Cross ...
Version 1.7.0 added support for traditional PKWARE encryption. Version 1.8.0 added support for Zstandard and lzma. When opening existing archives, a strict consistency check can be requested. libzip is written in C but can be used from C++. Since version 1.1, libzip contains ziptool, a tool for modifying zip archives from the command line.
The author, Wei Dai states "This code is less clever, but hopefully more understandable and maintainable [than zlib]". 7-Zip: written by Igor Pavlov in C++, this version is freely licensed and achieves higher compression than zlib at the expense of CPU usage. Has an option to use the DEFLATE64 storage format.
Info-ZIP is a set of open-source software to handle ZIP archives.It has been in circulation since 1989. It consists of 4 separately-installable packages: the Zip and UnZip command-line utilities; and WiZ and MacZip, which are graphical user interfaces for archiving programs in Microsoft Windows and classic Mac OS, respectively.
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