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ArcMac - Just Solve the File Format Problem

ArcMac

From Just Solve the File Format Problem
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File Format
Name ArcMac
Ontology
Extension(s) .arc
Type Code mArc
Released 1988

ArcMac format is a variant of the ARC compressed archive format, with extended features relevant to classic Macintosh computers. It is associated with the ArcMac software by Don Gilbert and dogStar Software.

Contents

Discussion

There are three applications:

  • ArcMac - The full software for Mac (shareware)
  • ArcPop - Decompression-only software for Mac
  • xArcMac - Decompression-only software for DOS

Some "ArcMac" or "ArcPop" distributions don't contain all three.

The version numbers and release dates of these things, and of the included documentation, do not seem to have been updated consistently, and are difficult to make sense of.

The documentation claims that the distribution includes source code for ArcPop and xArcMac, in a file named "MARCS.ARC". Unfortunately, we have not located such a file.

Identification

ArcMac files start with 0x1b, and have 0x1a at offset 59, as the start of an ARC-compatible header.

Specifications

  • Refer to the "ArcMac File Structure" section in the ArcMac2.Doc or ARCMAC.DOC file included with most ArcMac distributions.
  • macutil → macunpack/arc.h has some info (though macunpack does not support the format)

Software

The extent to which ArcMac format is compatible with ARC decompressors that are not ArcMac-aware is unclear. It can work in some limited cases, but is not reliable.

Personal tools
Namespaces

Variants
Actions
Navigation
Toolbox

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