The file part10.rar is just one segment of a larger split archive. You cannot use it by itself; you must have (part1 through part10, etc.) in the same folder to successfully extract the game data. Step-by-Step Installation Guide Collect All Parts
Paste them into the main directory where you installed the game, choosing when prompted. Play Call.of.Duty.WWII.Shadow.War-CODEX.part10.rar
The software will automatically pull data from all subsequent parts (including part10) to create a single ISO file or a folder containing the game files. The file part10