ARJ

File Format
Name	ARJ
Ontology	Electronic File Formats Archiving ARJ
Extension(s)	.arj
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.).

See also:

• JAR (ARJ Software)
• SDN (SDN Project)

Specifications

• The ARJ/UNARJ distributions include detailed format information, in a file named TECHNOTE.TXT or similar.
  • A copy of the 2001-09 version (with an addendum of some sort)
• The ARJ Archive File Format, from fileformat.info and Corion.net

Software

• Official homepage of ARJ software
• 7-Zip
• Open-source ARJ
• Konvertor

Sample files

• http://cd.textfiles.com/20mnn/HPTEXT/PHRACK/
• The Silver Collection CDs have many ARJ files

Links

• Wikipedia article