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## Summary Moves the MSIX sparse package's `ExternalLocation` from the PowerToys root install folder to the `WinUI3Apps\` subfolder, isolating DACL contamination from preview handler DLLs. ## Problem On Windows 23H2/24H2/25H2, MSIX sparse package registration adds AppContainer SIDs (`S-1-15-2-*` / `S-1-15-3-*`) to the DACL of the `ExternalLocation` folder. Since `ExternalLocation` pointed to the PowerToys root install folder, this broke File Explorer preview handlers — `prevhost.exe` (running at LOW integrity) could no longer load preview handler DLLs (`.txt`, `.md`, `.pdf`, `.svg`, etc.). ## Fix - **`CustomAction.cpp`**: Changed `ExternalLocation` from `installFolderPath` → `installFolderPath + L"WinUI3Apps\\"` - **`AppxManifest.xml`**: Removed unused PowerOCR `<Application>` entry; stripped `WinUI3Apps\` prefix from `Executable` paths (now relative to new ExternalLocation) - **`CmdPal.Ext.PowerToys.csproj`**: Moved `OutputPath` to `WinUI3Apps\` so the AOT-compiled extension EXE resolves correctly under the new ExternalLocation - **WiX installer files**: Updated source/install paths for KBM assets, CmdPal satellite assemblies, and `CommandPalette.Extensions.winmd` that moved with the CmdPal output - **ESRP signing**: Updated CmdPal dll/exe paths to include `WinUI3Apps\` prefix ## Validation | Test | 25H2 | 23H2 | |------|------|------| | DACL isolation (no S-1-15-* on root) | ✅ | ✅ | | Preview handlers (.txt, .md, .pdf, .svg) | ✅ | ✅ | | Peek | ✅ | ✅ | | Context menus (PowerRename, FileLocksmith, ImageResizer, New+) | ✅ | ✅ | | Upgrade path (old → new) | ✅ | ✅ | ## Files changed (12) - `installer/PowerToysSetupCustomActionsVNext/CustomAction.cpp` — core fix - `src/PackageIdentity/AppxManifest.xml` — manifest cleanup - `src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.PowerToys/Microsoft.CmdPal.Ext.PowerToys.csproj` — output path - `src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.PowerToys/Helpers/PowerToysResourcesHelper.cs` — icon path - `installer/PowerToysSetupVNext/BaseApplications.wxs` — winmd source path - `installer/PowerToysSetupVNext/KeyboardManager.wxs` — KBM assets path - `installer/PowerToysSetupVNext/Resources.wxs` — CmdPal satellite paths - `installer/PowerToysSetupVNext/generateAllFileComponents.ps1` — scan path - `.pipelines/ESRPSigning_core.json` — signing paths - `src/PackageIdentity/BuildSparsePackage.ps1` — dev script hint - `src/PackageIdentity/readme.md` — docs - `doc/devdocs/modules/cmdpal/powertoys-extension-local-development.md` — docs --------- Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>