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This article is about the compressed file format. For other uses, see ARJ (disambiguation).
Filename extension .arj
Uniform Type Identifier (UTI) public.archive.arj
Developed by Robert K. Jung
Type of format archive format

ARJ (Archived by Robert Jung) is a software tool designed by Robert K. Jung for creating high-efficiency compressed file archives. ARJ is currently on version 2.86 for DOS and 3.20 for Windows and supports 16-bit, 32-bit and 64-bit Intel architectures.[1]

ARJ was one of two mainstream archivers for DOS and Windows during the early and mid-90s, with PKZIP being its competition. Parts of ARJ were covered by U.S. Patent 5,140,321. Generally ARJ was less popular than PKZIP, but it did enjoy a niche market during the BBS era and in the warez scene. This was largely due to ARJ's creation and handling of multi-volume archives (archives which are split into smaller files which are then suitable for dial-up transfers and floppy distribution) being more robust than PKZIP's.

In recent times, other alternatives to the ZIP archive, such as RAR or 7-Zip have surpassed ARJ in market share;[citation needed] the lack of an official graphical version may have contributed to ARJ's decline.

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