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ARJ

From Wikipedia, the free encyclopedia
Compression software
This article is about the compressed file format. For other uses, see ARJ (disambiguation).
Archived by Robert Jung
Filename extension
.arj
Uniform Type Identifier(UTI) public.archive.arj
DevelopedbyRobert K. Jung
Initial release1991;35years ago(1991)
Latest release
2.90 (MS-DOS), 3.31 (Windows)[1]
November3, 2025;9 months ago(2025年11月03日)[1]
Type of formatarchive format
Open format?Yes (patent expired)
Websitearj32.com

ARJ (Archived by Robert Jung) is a software tool designed in 1991 by Robert K. Jung for creating high-efficiency compressed file archives. ARJ is currently on version 2.90 for MS-DOS and 3.31 for Microsoft Windows and supports 16-bit, 32-bit and 64-bit Intel architectures.[1]

ARJ was one of many file compression utilities for MS-DOS and Microsoft Windows during the early and mid-1990s. Parts of ARJ were covered by U.S. patent 5,140,321 (expired). ARJ is well-documented and includes over 150 command line switches.

File format support in other software

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ARJ archives can be unpacked with various tools other than the ARJ software. There exists a free software re-implementation of the tool. A number of software utilities, including 7-Zip, Total Commander, Zipeg, and WinRAR can also unpack .arj files.[2] For macOS, standalone utilities, such as DeArj and UnArjMac, are available.

See also

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References

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  1. 1 2 3 "ARJ Software". 2025年11月16日. Retrieved 2025年11月16日.
  2. "File Type: ARJ Compressed File Archive". Archived from the original on 2016年03月04日. Retrieved 2019年04月08日.
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