I asked Rene Smit this a long time ago on his forum. As it is GPxPatch already increases the default .dat size to 136Kb in GP3 v1.13. I don't know what the original limit was! If Rene couldn't get this any higher, I doubt there's anyone around now who could. The only way forward is to buy GP3-2000. Try e-bay,charity shops, 2nd hand departments of game retailers. It's worth the investment, just to get Belini's awesome track collection running with all the details intact.