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ConcaDec is an easy-to-use and very effective freeware which can divide and join any file you like.
Main Features
Generates a tiny automatic rebuild file.
Generates a checksum (MD5, SHA-1, SHA-224, SHA-256).
Can handle files which are larger than 4 GB.
Division preview.
Progress display.
Processing can be paused or cancelled at any time.
Several division options: by size, by number of files, etc.
A great many choices of predefined sizes.
Drag-and-drop facilities.
No required installation (only an executable file).
Multilanguage support: English, French, Spanish.
OS requirements: Windows 2000/XP/Vista/7.