uToolbox FileSplitter Tool is a freeware utility useful to split large files
of any type, up to 4 Gb, into a set of small files and join the small files
to remake the original file. You can specify the number of small files to be
generated from the original file. Enter (or browse to) the full path of the
file to be split and then the folder path where you want the split files to
be placed. (in System Utilities)