![]() The precise composition of the blocks evolved over time with the versions. Structurally, a RAR file is comprised of variable length blocks of required and optional data. RAR files are the native format for WinRAR software and can only be created through this tool which is licensed to win.rar GmbH although there are several options to open RAR files. RAR is a proprietary format under copyright, along with RAR's compression applications and libraries to Alexander Roshal, brother of Eugene Roshal. Similar in purpose to ZIP files, RAR files are data containers in which one or more files are stored in compressed form. See Relationships below for more details. ![]() The current version as of this writing is RAR5. RAR4 is also known as RAR version 2.9 in some documentation. The early versions RAR1.3 and especially RAR1.5 are thought to be the base for later versions but no public documentation is available about these early versions. ![]() ![]() There are at least six main versions and subversions of the RAR format and because the early versions have little formal documentation, only selected versions currently are described at this site. RAR, or the Roshal ARchive format thanks to its namesake creator software developer Eugene Roshal, is a proprietary archive file format that supports data compression, error recovery and file spanning.
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