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<!-- Enter a brief description/summary of your PR here. What does it fix/what does it change/how was it tested (even manually, if necessary)? --> ## Summary of the Pull Request Migrate WPF/WinForms utility to WinUI3 can give us many benefit. 1. Only WinUI3 support AOT. By this change, we can remove the blocker to make imageResizer publish with AOT enabled to improve the performance. Through the previous testing in CmdPal, it can improve about 1.5x to 3x perf. 2. WinUI 3 provides a modern UI and makes sure that our experiences fit in with the Windows 11 look and feel. 3. We can merge many redundant code to the same one and reduce more codebase and installed size in the future if we successfully migrate all remaining WPF/WinForms utility to WinUI3. <!-- Please review the items on the PR checklist before submitting--> ## PR Checklist - [x] Closes: #46465 <!-- - [ ] Closes: #yyy (add separate lines for additional resolved issues) --> - [ ] **Communication:** I've discussed this with core contributors already. If the work hasn't been agreed, this work might be rejected - [x] **Tests:** Added/updated and all pass - [x] **Localization:** All end-user-facing strings can be localized - [ ] **Dev docs:** Added/updated - [ ] **New binaries:** Added on the required places - [ ] [JSON for signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json) for new binaries - [ ] [WXS for installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs) for new binaries and localization folder - [ ] [YML for CI pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml) for new test projects - [ ] [YML for signed pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml) - [ ] **Documentation updated:** If checked, please file a pull request on [our docs repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys) and link it here: #xxx <!-- Provide a more detailed description of the PR, other things fixed, or any additional comments/features here --> ## Detailed Description of the Pull Request / Additional comments <!-- Describe how you validated the behavior. Add automated tests wherever possible, but list manual validation steps taken as well --> ## Validation Steps Performed 1. Set up the ImageResizer as the startup project. 2. Start in visual studio. --------- Co-authored-by: Yu Leng (from Dev Box) <yuleng@microsoft.com> Co-authored-by: Niels Laute <niels.laute@live.nl> Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>