HJSplit

HJSplit is a freeware, multi-platform file splitter. Allowing you to separate a single file into multiple, easier to swallow chunks allowing transfer through E-Mail, the web, floppies or anything of the sort. Defaults to a full graphical interface based on the Kylix library but also includes a CLI based interface, and a GTK based interface.
HJSplit is used to split and join .001, .002 etc. parts.

http://hjsplit.en.softonic.com/download