The winui3-migration-guide skill provides a reference for developers migrating Universal Windows Platform (UWP) applications to WinUI 3 and the Windows App SDK, mapping deprecated UWP APIs to their correct modern equivalents with before/after code examples. It addresses critical areas including namespace changes, threading model updates (CoreDispatcher to DispatcherQueue), windowing changes (CoreWindow to AppWindow), and dialogs, while also identifying the three most common mistakes that code generation tools make during migration. The skill serves Windows desktop developers who need accurate API guidance to modernize legacy UWP codebases or validate that generated code follows WinUI 3 standards rather than outdated UWP patterns.
npx skills add https://github.com/github/awesome-copilot --skill winui3-migration-guide