The ".rar" file for the Collector's Edition (CE) typically includes several bonus features accessible from the main menu:
Access exclusive wallpapers, concept art, and the game’s soundtrack. Notable Solutions Mystery.Case.Files.Black.Crown.CE.rar
Look for morphing coral and hidden crabs in every scene. Missing items can be picked up in the "Extras" section after finishing the game. Mystery.Case.Files.Black.Crown.CE.rar