Microsoft has quietly introduced a new security feature in Windows 11 through the KB5074105 update, requiring a User Account Control (UAC) prompt to access Storage settings and thereby protecting system files from unauthorized changes. This non-security cumulative update, released on January 29, 2026, applies to Windows 11 versions 24H2 and 25H2, enhancing overall functionality and reliability. The UAC requirement aims to ensure only authorized users can interact with sensitive areas that could impact system integrity, as confirmed by Microsoft's official documentation.