Text File Splitter is a freeware program that will be able to split large text files. It has both a nice GUI and a command-line.

Tests with a 1.2 Gig text file split into 100 meg files average a little over 12 minutes total. Each file took about a minute to be created.

Detail

Author/Publisher:
SystemWidgets

Requirements:
Windows 98/2000/XP/Vista

Category:
Utility

Note:
To run this programs you will need Microsoft .NET Framework 3.5 installed on your system, you can download it here: .Net Framework 3.5

Download: