I have an old utility called split.exe which will split a file called fred (e.g.) into
fred.001
fred.002
etc
with each chunk a specified size. PM me with your email if you want a copy.
One can concatenate the pieces with the old dos COPY command:
copy /b fred.001+fred.002+fred.003... fred
Can't beat DOS. I used to design CPM2.2 machines way back
