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Microsoft Pushes WinUI 3 to Replace Decades‑Old Windows Dialogs

The company is testing WinUI 3 versions of long‑standing dialogs to deliver a more consistent, faster Windows 11 interface through Insider previews.

Overview

  • A leak and Windows Insider preview builds published on Wednesday showed a new, pared‑down File Explorer properties dialog and an option to enable a modern Run dialog for testing.
  • Microsoft has confirmed a program to replace legacy dialog boxes with interfaces built entirely on WinUI 3 to standardize styling and speed up UI loading.
  • Early screenshots show fewer tabs and less detail in the prototype properties view with full dark‑mode styling, suggesting features may be reduced or restored as development continues.
  • Engineers and reporters warn the rework carries real compatibility risk because many third‑party tools and drivers rely on old dialog APIs and integration points.
  • The changes remain in preview with no firm ship date; observers say the work could land as part of the larger 26H2 feature update in autumn 2026 but that outcome is unconfirmed.