In the context of the "CODEX" release file you mentioned, this is not a new story expansion but a technical patch. Historically, this update focused on:
The "story" within the game picks up after the events of the previous titles. After defeating Boss Cass, Ty and his friends from Bush Rescue are unexpectedly thrust into a new conflict. While Ty was away in another dimension (the Dreaming), Southern Rivers was invaded by an ancient, shadowy alien race known as the . TY.the.Tasmanian.Tiger.3.Update.v1.01-CODEX.rar
: Upon his return, Ty finds his home in ruins and his friends scattered. He must reunite the Bush Rescue team to form a resistance against the Quinkan occupation. In the context of the "CODEX" release file
: To fight back against the superior alien technology, Ty must recover powerful artifacts, specifically the Bunyip Gauntlets, which allow him to pilot massive combat mechs. While Ty was away in another dimension (the