If you need to break a large file to some smaller pieces for emailing (if your destination has a small in box capacity) or the files are too big for a zip disk or floppy, then look no further than this example.
http://audioplayer.sourceforge.net/filesplitter/
Supported Operating Systems: Win98, WinME, WinNT 3.x, WinNT 4.x, Windows 2000, WinXP, Windows Server 2003
System Requirements: Internet Explorer 5
Install Support: Just unzip and go, no installation needed
It will also join em up for you when done.
Direct download is here: http://audioplayer.sourceforge.net/filesplitter/filesplitter.zip
It's size is less than 30k