ARJZ

File Format
Name	ARJZ
Ontology	Electronic File Formats Archiving ARJZ
Extension(s)	.arj
Released	~1995

ARJZ is a compressed archive utility, primarily developed by Булат Зиганшин (Bulat Ziganshin, according to translation software). Its native file format is an incompatible variant of ARJ.

Format details

ARJZ supports at least two new compression methods. Unfortunately, instead of inventing new compression method identifiers, it puts special values in the archiver version number field, and (at least when using the -t9 option) the file type field.

ARJZ compression is similar enough to ARJ that in some cases, especially for small files, it may be decompressible by standard ARJ software. But in general, it is incompatible.

Identification

Like ARJ, an ARJZ file starts with bytes 0x60 0xea, and has 0x02 at offset 10.

Unlike ARJ, an ARJZ file usually has 0x33 at offset 5 (meaning archiver version = 51). The documentation implies that this byte can also be 0x32, but confirmation is needed.

Software

• ARJZ 0.15 alpha - Includes binaries for DOS, OS/2, and Windows NT console.
• UNARJZ 0.15 beta