If you have an installer or game that uses commands or syntax not suppored in DOSBox's shell, it's a simple matter to use the 4DOS shell in such cases, but really unusual syntax may throw off 4DOS as well.

In this case the /B (binary) switch only needs to be specified once, because all source files are binary, e.g. COPY /B 1+2+3 123; however, the COPY command in DOSBox's shell always does binary copies, so the switch has no real effect.

Thanks, but those are all just ways to circumvent this behavior, which I already did. The point is, I can't install this game from original floppies in DOSBox without modifying the .bat on the floppy (as it deletes the originals of that copy command after the copy) despite it only using standard MS-DOS commands. To me, that's a flaw/bug in the emulator, which I thought was worth reporting.

hydr0x wrote:

The point is, I can't install this game from original floppies in DOSBox without modifying the .bat on the floppy

You seem to be missing the point that the game would probably install just fine without modifying anything if you use the 4DOS shell. Problem reports are appreciated, but please understand that DOSBox's shell does not support everything the command interpreter in real DOS does, and it likely never will.