The nanocom map wizard generate original map files wich you can send to de the ecu via OBD II. The ECU run a internal routine, and write this maps in the flash. But when you have the 29f200 in your hand and you want write them with a eprom programer, you need the complete memory image, 256k.
I can read these image from a good ecu, but It is very dificile of extracting the flash SMD.