How to merge several files into one without unnecessary copying?

Question

Windows

There are several large files, I want to "glue" them into one big one. The original files may not be saved. Tell me, are there any standard tools in the Windows world? Or a third party utility? Or at least how to write it by hand, for example, in python?
I don't like the head-on 'copy a + b c' option, because will create a copy, spending extra time and space on this procedure.

Answer 1

Try HJ-Split .

Answer 2

You need to know the materiel ...
copy /b file1 + file2 + file3 result

Answer 3

What kind of files is that? .. Text, pictures? ..

Answer 4

cat file2 >> file1
doesn't work? On Windows, streams also work, I don’t remember how cat is done, though
upd: stackoverflow.com/questions/60244/is-there-replacement-for-cat-on-windows

Answer 5

And how is it “do not save the original files”, but you need to glue large existing files together? Do the files exist or not yet?
If there is, then through append (>> or +). If not, then the program that creates them must append when it opens a file of the same name.
In python, this is open('filename.bin','aw')