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The ARJ file format, which stands for 'Archived by Robert Jung', was created in 1990 by Robert Jung as a data compression and archiving tool. It was particularly popular in the DOS operating system environment, where it provided a means to reduce file sizes and bundle multiple files into a single archive. ARJ supports various compression algorithms and provides features such as file spanning, encryption, and the ability to store file attributes, making it a versatile choice for users needing to manage large sets of files efficiently.
One of the key advantages of the ARJ format is its high compression ratios, which often outperform other contemporary formats like ZIP and LHA. This efficiency made it a preferred choice for distributing software, especially in bulletin board systems (BBS) and on early internet platforms. The format also includes error recovery capabilities, ensuring that damaged archives can often be repaired and accessed.
As operating systems evolved, the popularity of ARJ waned in favor of more modern formats like ZIP and RAR, which offered improved usability and integration with newer software. Nevertheless, ARJ maintains a loyal following, particularly among retro computing enthusiasts and users who require compatibility with legacy systems.
ARJ files are typically identified by the '.arj' file extension and can be created and extracted using various command-line interfaces or graphical user interface applications. While the format may not be as widely adopted today, it is still recognized for its historical significance in the realm of data compression.
In sum, the ARJ format represents an important chapter in the evolution of file compression, showcasing the need for efficient data management solutions in the early days of personal computing.