Or use this small tool.
http://fileforums.com/showthread.php?t=96455
To have 4 cab's in the end, use "1107" for splits.
4470 (max DVD capacity) - Setup.exe (~40Mb) = 4430 / 4 = 1107mb
After it's done, simply rename the text files to the dataX.lst and replace. Start compress.bat, choose game dir and wait.