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Main article: By default, 7-Zip creates 7z-format archives with a.7z. 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,, and encryption filters. The core 7z compression uses a variety of, the most common of which are,,,.

Developed by Pavlov, LZMA is a relatively new system, making its debut as part of the 7z format. LZMA uses an LZ-based sliding dictionary of up to 4 GB in size, backed by a.

The native 7z is open. Are stored as. In 2011, found that the 7z compression was at least 17% better than, and 7-Zip's own site has since 2002 reported that while compression ratio results are very dependent upon the data used for the tests, 'Usually, 7-Zip compresses to 7z format 30–70% better than to zip format, and 7-Zip compresses to zip format 2–10% better than most other zip-compatible programs.' The 7z file format specification is distributed with the program's source code, in the 'doc' subdirectory. Others [ ] 7-Zip supports a number of other compression and non-compression archive formats (both for packing and unpacking), including,,,,. The utility also supports unpacking,,,,,,,,, MSLZ,,,,,,,, and archives and,,,,,,,,,.

7-Zip supports the ZIPX format for unpacking only. It has had this support since at least version 9.20, which was released in late 2010. 7-Zip can open some files, allowing access to the meta-files within along with the main contents. Some Microsoft CAB ( compression) and (LZMA) installer formats can be opened.

Sherhoi yoshiki bacha baroi duhtar navisht. Similarly, some Microsoft executable programs (.) that are self-extracting archives or otherwise contain archived content (e.g., some setup files) may be opened as archives. When compressing ZIP or gzip files, 7-Zip uses its own encoder, which may achieve higher compression, but at lower speed, than the more common DEFLATE implementation.

The 7-Zip deflate encoder implementation is available separately as part of the suite of tools. The decompression engine for archives was developed using freely available source code of the unRAR program, which has a licensing restriction against creation of a RAR compressor. 7-Zip v15.06 and later support extraction of files in the RAR5 format.

Some systems use formats supported by archiving programs such as 7-Zip; e.g., some backups are in tar format, and can be extracted by archivers such as 7-Zip. File manager [ ] 7-Zip comes with a file manager along with the standard archiver tools. The file manager has a toolbar with options to create an archive, extract an archive, test an archive to detect errors, copy, move, and delete files, and open a file properties menu exclusive to 7-Zip. The file manager, by default, displays hidden files because it does not follow 's policies.

The tabs show name, modification time, original and compressed sizes, attributes, and comments (all comments for a directory's files are stored in a text file on that directory called descript.ion, which can be edited offline). When going up one directory on the root, all drives, removable or internal appear. Going up again shows a list with four options: • Computer: loads the drives list • Documents: loads user's documents, usually at%UserProfile% My Documents • Network: loads a list of all network clients connected •.: Same as 'Computer' except loads the drives in low-level access. This results in critical drive files and deleted files still existing on the drive to appear. (NOTE: Access to the active partition in low-level mode is not allowed for currently unknown reasons.) Software development kit [ ] 7-Zip has a which was originally under both the and, with an additional special exception for linked binaries. In December 2, 2008 the SDK was by Igor Pavlov in the. Variants [ ] Two versions are provided: 7z.exe, using external libraries; and a standalone executable 7za.exe, containing built-in modules, but with compression/decompression support limited to,,,, and formats.