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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 The old implementation checked `HKLM\Software\Classes\powertoys\InstallScope` first. If this key existed (even as a remnant from incomplete uninstall), it would immediately return `PerMachine` without validating the actual installation. ### Fix - Uses Windows standard Uninstall registry (most reliable source of truth) - Identifies PowerToys Bundle by exact `BundleUpgradeCode` GUID match - MSI component entries (always in HKLM) are automatically ignored since they don't have `BundleUpgradeCode` - Checks HKCU first, then HKLM, properly handling the fact that Bundle location reflects true install scope <!-- Please review the items on the PR checklist before submitting--> ## PR Checklist - [x] Closes: #43696 <!-- - [ ] 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 - [ ] **Tests:** Added/updated and all pass - [ ] **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