copy - strange behaviour at files bigger than 4 GB

[fritzmueller]

I tested the copy command and found a strange effect:
In Win and in Linux files cannot be copied on FAT32 when they are bigger than 4 GB. There is an error message that prevents this.
So far ok.
In FreeDOS I tested the copy command with 3 files, 1,6 GB each, the files contain only "AAAA...." or "BBBB..." or "CCCC...".
I ran:
copy filea.txt + fileb.txt + filec.txt filenew.txt (alltogether 3 x 1,6 = 4,8GB).
It runs through, there is NO error message, but the result is as follows:
filenew.txt contains the following text:
0,8 GB "C" at the beginning followed by 0,8 GB "A" then 1,6 GB "B" and 0,8 GB "C".
This means: it simply starts with the text that cannot be written at the beginning.
Not a big problem, but an unusual behaviour.

[PerditionC]

looks like the write wraps around or otherwise overflows overwriting beginning of file. It should error with insufficient space and prevent the copy.