nulldc sega dreamcast help about a couple of games

Hi guys,Hopefully someone can help me,
Ive got nulldc 1.0.3 for window xp working (so far i think this is the latest version that i can tell)and it works really well with most games such as daytona usa etcbut does anyone know if theres a way to play sega rally 2 (u) & propeller arena (e)
as so far i get a opcode error 38 when it tries to boot upsome websites Ive seen say these games are compatible with this emulator,so i was hoping I'm missing a fix file or something T :thanks to anyone help