WinUI 3

Microsoft is replacing the legacy File Explorer Properties dialog box in Windows 11 with a modern version powered by WinUI 3. This change aims to improve the performance and reliability of Windows 11. The current Properties dialog does not support dark mode, which has been an issue for users. Recent findings from Windows 11 Insider builds indicate that Microsoft is actively developing a new file properties dialog. Strings for “DeletedFileProperties” have been discovered, suggesting the old dialog will be replaced. Microsoft is also modernizing outdated Windows 8 UI elements within Windows 11. The introduction of the WinUI 3 properties dialog is expected to enhance File Explorer's performance by streamlining its hybrid codebase. Users can anticipate gradual updates throughout 2026, with a rollout to the Experimental channel expected later this year.