ARJ

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File Format
Name ARJ
Ontology
Extension(s) .arj, .a01, ...
PRONOM fmt/610
Wikidata ID Q2693033
Released 1990 (beta), 1991 (v1.00)

ARJ is a compressed archive format, and associated software. It was developed by Robert Jung.

ARJ was one of the leading compression tools during the 1990s. While it was a bit slower than PKZIP, it sported many more options, some of which were unique during that time (archives over multiple disks/volumes, fine-tuning of the compression algorithms used based on the data that was being compressed, recovery records to recover from simple transmission errors, etc.).

Contents

See also

Compression methods

ID Name Description
0 stored No compression
1 compressed most LZ77+Huffman. For decompression purposes, these are all more-or-less compatible with LHA's "lh6" method.
2 ...
3 ...
4 compressed fastest LZ77
8 no data, no CRC
9 no data

Identification

An ARJ archive starts with signature bytes 0x60 0xea.

The full identification algorithm used by the ARJ software is given in its technical documentation.

Specifications

Software

Ed. note: Newer versions of unregistered ARJ/ARJ32 have a hard-coded expiration date, and may have a long delay when you run them (several minutes, if it's been a long time since expiration).

Sample files

Links

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Variants
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