If you are sharing this file with other developers or sysadmins, focus on the technical specs.
Could you share or what you think is inside it? I can then draft a specific outline or full post for you.
Inside bwdbl.rar: Analyzing the New [Project/Data] Update. Key Sections:
Use clear, numbered steps to make the technical process easy to follow. 2. The Tech Analysis Angle (If it's a Script or Data)