Codemasters using new archives for DIRT4.
Unpack seemed to succeed with quickbms, but repack still impossible.
I hope someone find a way to repacking.

Almost xml values remains in hash ID but I'm trying to modding them.
Here are a sample; police vehicles spawn as traffic
You can see more police vehicles and steal safely.

Anybody researching binaryclass of "vehiclespawninfo" and "trafficconfig"?
It'll allow to change vehicles spawn settings

sorry guys I'm in this business just a kid, but I see you're a pro. please tell me, is it possible to open these .big files? Researching and creating tools cannot be done in just a few days. (especially from scratch) In case of JustCause2 it took two or three weeks to release extract/repack tools. ...

I've never seen any PC games created by this developer.
Perhaps it takes a long time to release unpack-repack tool.
I think .big is archive and .bix is its index.