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Macbinary is a format for data transfer using the "xmodem" file
transfer protocol.  The file transferred appears as an ordinary binary
file to the xmodem protocol machine.  However, the data contains the
information required in the embedded header for a receiving Macintosh
to separate its component forks on-the-fly.  Conversely, a sending
Macintosh constructs the header and assembles the component forks into
a single binary stream for the transfer.  Such a stream can be stored
on any intermediate machine as an ordinary 8-bit binary file using a
conventional xmodem file transfer program on the intermediate machine.

There are programs available for Unix and other systems to disassemble
the single stream file into its component forks and reassemble them as
well.  The source for these programs contain the comments to describe
the file structure.  See PD2:<UNIX-C.MACINTOSH> here for several such
files.

--Frank