Model.blob

This is storing bounding boxes for all models. It was added in Cataclysm to help with streaming data.

MBVR

uint32_t version;

MBBB

struct {
  uint32_t filenameOffset; // into MBFN chunk
  CAaBox boundingBox;      // No idea of colision or vertex bounding box.
} entries[];

MBFN

char filenames[]; // zero-terminated, no file extensions.