How do you tag one file onto the end of another?

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I know one way to join files: in a command box,

copy /b filea+fileb filec

.. However, if filea is huge, this takes a noticeable time, because the entirety of filea is copied to filec (followed by fileb, obviously).

I know with text files, you can just append things to another file - e. g.

dir >> filea

will I think append a directory listing to filea, or

type fileb >> filea

will append fileb to filea - but only if it's a text file.

Anyone know how to concatenate arbitrary files, without involving a third file?
--
J. P. Gilliver. UMRA: 1960/<1985 MB++G.5AL-IS-P--Ch++(p)Ar@T0H+Sh0!:`)DNAf
** http://www.soft255.demon.co.uk/G6JPG-PC/JPGminPC.htm for ludicrously
outdated thoughts on PCs. **

Mathematics is the language with which God has written the universe. -Galileo
Galilei, physicist and astronomer (1564-1642)
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