RAR is a popular file archiving and compression format introduced for WinRAR (Eugene Roshal, 1995), a file archiver utility released for Microsoft Windows operating systems only. RAR compression is based on Lempel-Ziv LZSS and prediction by partial matching PPMd/PPMII (Dmitry Shkarin), which provides very good compression ratio, almost comparable with 7Z format.
Rar File Creator software, free downloadThe format also features data recovery capabilities (if optional recovery records are used while creating the archive), and optional AES based encryption.

With HelloNzb you can download (binary) files from Usenet servers via NZB index files. The software is based on Java and can thus run on many platforms (tested on Windows and Linux). Automatic archive verification via PAR2, automatic RAR archive extraction, built-in yEnc- and UU-decoding. Portable, no installation required. RARLAB's RAR is an all-in-one, original, free, simple, easy and quick compression program, archiver, assistant, extractor, manager and even a basic file explorer. RAR can create RAR and ZIP and unpack RAR, ZIP, TAR, GZ, BZ2, XZ, 7z, ISO, ARJ archives. How to open RAR files. Save the.rar file to the desktop. If your compressed file was downloaded from a website, it may be saved in the Downloads folder in your Documents or user directory. Launch WinZip from your start menu or Desktop shortcut. Open the compressed file by clicking File Open. Orion File Recovery Software is a free file recovery program from NCH Software that's basically the same as most of the other programs in this list. A nice wizard prompts you to scan for specific file types at the launch of the program, like documents, images, videos, music, or a custom file type.

WinRAR is a data compression tool for Windows that focuses on RAR and ZIP files. It also supports CAB, ARJ, LZH, TAR, Gzip, UUE, ISO, BZIP2, Z and 7-Zip.


'RAR' acronym stands for 'Roshal ARchive', from the surname of the author.

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Reference

what is a RAR file
PeaZip, freeware and open source archiver utility, can open and extract RAR files on Linux and Windows, using the Open Source code written by Igor Pavlov in 7-Zip and its POSIX port p7zip project.
Additionally, PeaZip can automatically configure itself to use WinRAR's Rar.exe to create RAR files from PeaZip's own GUI, but only if WinRAR is installed in the system, as due RarLab's licensing terms for rar format no third parts utility can distribute a rar creation tool, unless asking RarLab for licensing the format.
No alternative Open Source free RAR archiver utility (rar creator) is available: UNRAR is available as royalty-free and open source software for allowing extraction of RAR archives both on Linux and Microsoft Windows, but with the clause of not reverse engineering the code for implementing RAR compression which prevents development of royalty free rar archivers & compressors capable to create or add files to said format.
The non reverse engineering clause about the RAR compression algorithm and code apply as well for any rewritten version, so no Free Software, royalty free RAR archiver and compressor can be created under current licensing terms. In other words, no open source alternative exist to WinRar's Rar.exe
Consequently, due to RAR's license constrains, no free software can be written to be natively capable of writing RAR archives (which is required both for RAR archive creation, add / update and repairing), unless licensing clause is circumvented calling (Windows / Wine -only) WinRar's executable rar.exe itself, that requires having WinRar (shareware, free for 40 days only) downloaded and installed as a separate product.
Please note that WinRar license's time trial legal limitations apply to any part of the package (as i.e. Rar.exe) as well, even if it does not display the warning screen as the main WinRar's GUI executable.
More online resources: RarLab's WinRAR shareware rar file archiver official domain, Lempel-Ziv LZSS and prediction by partial matching PPMd/PPMII Wikipedia pages.

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With over 500 million users worldwide, WinRAR is the world’s most popular compression tool!

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4 Ways To Open RAR Files - WikiHow

There is no better way to compress files for efficient and secure file transfer. Providing fast email transmission and well-organized data storage options, WinRAR also offers solutions for users working in all industries and sectors.

Rar File Creator software, free downloads

RAR and WinRAR are Windows 10 (TM) compatible; available in over 50 languages and in both 32- and 64-bit; compatible with several operating systems (OS), and it is the only compression software that can work with Unicode.
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