Which "bsplit" are you using. I just did a Google search to find one to download and try and I came up with lots of different versions.
I use a DOS program called FILECUT.EXE (full name File-Cutter v1.0 written by Yen Chui Tin (Stannon Yen)) that I've had around for years when I have to move larger than floppy files. If you want a copy I can send it to you.
