MAR Utility
From Just Solve the File Format Problem
A MAR archive is a utility created by PCE developer Hampa Hug.[1] The purpose is to combine features of MacBinary and TAR, encapsulating the Resource Fork, Data Fork, and Finder data of a classic Macintosh file.
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File Information
MAR files always contain exactly one item, either a single file or a folder and its contents (including subfolders). By convention archives that contain a file get the extension .MAC (this is basically equivalent to a MacBinary file) and archives that contain a folder get the extension .MAR. It is the same file format, though.[2]
Format Information
MAR file will begin with the hex values 4D415280
.