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## Summary Follow-up fix for #47177. Installs `CommandPalette.Extensions.winmd` to the `WinUI3Apps\` directory (ExternalLocation) instead of the root install folder. ## Problem PR #47177 moved the sparse package's `ExternalLocation` from root to `WinUI3Apps\`, but the `CommandPalette.Extensions.winmd` was still installed to root via `DirectoryRef=INSTALLFOLDER`. The WinRT runtime needs this winmd in the ExternalLocation directory for COM proxy/stub creation during cross-process CmdPal extension activation. Without it, `CoCreateInstance` returns `E_NOINTERFACE` and the PowerToys extension fails to load in Command Palette. ## Fix Split the `BaseApplications.wxs` `DirectoryRef` into two blocks: - **winmd component** -> `WinUI3AppsInstallFolder` (for WinRT COM marshalling) - **auto-generated components** -> `INSTALLFOLDER` (unchanged, avoids ICE30 conflict with `WinUI3ApplicationsFiles`) ## Validation - [x] Local WiX compilation: no ICE30 errors - [x] ADO CI build 145429943 (v0.99.1): passed - [x] Manual verification on 25H2: CmdPal loads 55 commands after winmd placed in WinUI3Apps Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>