my method is very diferent. very imprecise about size, but if you want part this bat file give you parts.
MULTIPART.7z
1
[img=10024]1[/img]
2
[img]10025[/img]
3
[img]10026[/img]
4
[img]10027[/img]
5
[img]10028[/img]
6
[img]10029[/img]
7
[img]10030[/img]