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RAR Archives (Roshal Archive file format) is a proprietary format for storing information created by Eugene Roshal. The format is currently handled by Alexander Roshal, Eugene's relative.


The file has the magic number of:

52 61 72 21 1A 07 00



The RAR format is comprised of many sub-formats that have changed over the years. The different formats and their descriptions are as follows:


This only way to create a RAR file is using the Winrar software. There are several implementations of the process to open a RAR file (commonly known as the "unrar" process). Some of them are:

  • RAR file unarchiver written in C
  • Easy implementation with a header file and the source code file
  • Information Link
  • Created by Eugene Roshal for opening up RAR files only
  • May not be used to reverse engineer the RAR file format and create RAR files
  • Source code provided for people to implement/integrate methods of opening RAR files
  • Additionally, implementations of UnRAR are available for a plethora of operating systems
  • Download Link
The Unarchiver
  • Utility made for Windows applications to open a multitude of files, including RAR files
  • Download Link

See Also