Rare monster appearance rate?

Hi everyone! Quick question, I noticed the appearance rate for most monsters in the tethealla.ini was set to like 7 or 8 divided by 1000. Does anyone know if this is the original appearance rate for the client? I heard it was 1/512 back in the day on consoles...which is a very minor difference.

I just want to recreate as nostalgic as possible now that I have things up and running.

Thanks to sodaboy and everyone for the guide and help! You guys are awesome!