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AppleDouble header file

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A separate file in a filesystem containing the Apple resource fork for a related data file, developed by Apple for A/UX and therefore compatible with other filesystems including those mounted remotely. They are heavily used under Mac OS X .

This file is named the same as the data file, with "._" prepended to the original name. These header files are automatically included in ZIP files under a hierarchy starting with "__MACOSX" when utilizing the Finder's "Archive as..." function.

from "A/UX Toolbox: Macintosh ROM Interface manual", Chapter 6 File Systems and File Formats
identifies the magic number 0x00051607 for AppleDouble files as the first 4 bytes in the file
background and additional information
MIME Encapsulation of Macintosh files - MacMIME