at
http://realbot.bots-united.com/files/grabber.zip
you can download the dat file unpacker. You can simply copy this program into the same directory as where the demo is installed, then run it , open up a dat file and you can extract the information as BMP files. Nothing to it
keep in mind, the Grabber data file manager creates Header files (for source) if you save the DAT file again. If you want to use your own graphics, REPLACE them only. Do NOT add new gfx, if you do, the game will not work properly.