ARQ

ARQ is a compressed archive format, apparently associated with the Crusher data compression toolkit by DC Micro Development. It is supported by a DOS program named "ARQ Crusher!".

The format was apparently used by several installer programs, notably Setup Factory by Indigo Rose, whose packages may include an ARQ-format file named IRDATA.IRD.

Identification
ARQ files start with bytes hex.

Software

 * ARQ.EXE
 * [ ARC Crusher! v3.2 1997-02-03]
 * Archived copies of arq.exe

Sample files

 * https://telparia.com/fileFormatSamples/archive/arq/
 * → IRDATA.IRD

Links

 * DC Micro website (2014 archive)