The "CODEX" tag indicates this is a release from a specific software cracking group.
Truberbrook (stylized as ) is an award-winning, sci-fi mystery adventure game set in 1960s rural Germany. The specific file you mentioned, Truberbrook.Update.1.12-CODEX.rar , refers to a software update released by the scene group CODEX , which was active in providing cracked versions and updates for PC games until their retirement in 2022. Game Overview Truberbrook.Update.1.12-CODEX.rar
Improvements to loading times and performance on mid-range PC hardware. The "CODEX" tag indicates this is a release