Splitter XP Description:

SplitterXP will allow you to split large files into smaller pieces of any specified size and viceversa to facilitate archiving, mailing, or transporting them. Splitting and reintegration to and from floppy disks is automatic.

This utility includes a very powerful algorithm to ensure that the whole partition / reintegration process is made without errors. The executable is self contained and so small you can run it from a floppy disk.

SplitterXP is, of course, WindowsXP-enabled. You won't find any file splitter with a cleaner or more powerful interface.