The name "part09" indicates it is the 9th volume in a set. You cannot extract this file alone; you need (e.g., part01 through part09) in the same folder to successfully combine and open them. Step 1: Gather All Parts

Ensure you have every preceding part in your folder (M&B2BBDD.part01.rar, part02, etc.).

This file is likely part of a , specifically for a Mount & Blade II: Bannerlord (M&B2) mod or game-related content.