Worked on documentation improvements for the MicrosoftDocs/defender-docs repository, focusing on clarifying antimalware validation workflows. Enhanced the validate-antimalware.md guide by providing explicit instructions for EICAR test file validation, including a deterministic step using the Command Prompt to run 'type EICAR.txt'. This update aimed to reduce customer confusion regarding Windows Defender behavior and streamline the validation process. Utilized Markdown for documentation and applied strong technical writing skills to ensure clarity and accuracy. No bug fixes were recorded during this period, but the work contributed to lowering potential support inquiries by making validation steps more transparent and reproducible for end users.