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 etc

but 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 up

some 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