Open:
FIFA Manager 08: Code (money) Free Download
FIFA Manager 08 \ user \ objects >>> house.txt
Find the line:
Palace, Palais, Schloss, Palacio, Palazzo, PaBac, -120000000, palace.bmp, 2005
where -120000000 you can put more zeros. Then go to buy home and buy Palace. You will be given the amount that you indicated (if so -120000000, then 120,000,000)