ARJ

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

Overview

ARJ was one of the leading compression tools during the nineties. 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, finetuning of the compression algorithms used based on the data that was being compressed, recovery records to recover from simple transmission errors, etc.)

Resources

• official homepage of ARJ software[1]
• Wikipedia page on ARJ[2]
• Page on fileformat.info[3]
• Another, slightly more verbose, file format description[4]
• Open-Source implementation of an ARJ compressor/decompressor[5]