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.[1] 7-Zip uses its own 7z archive format, but can read and write several other archive formats. The program can be used from a command-line interface as the command p7zip, or through a graphical user interface that also features shell integration. Most of the 7-Zip source code is under the GNU LGPL license; the unRAR code, however, is under the GNU LGPL with an "unRAR restriction", which states that developers are not permitted to use the code to reverse-engineer the RAR compression algorithm.
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 Windows Explorer'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 NTFS 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.)
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