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Oliver Kieselbach
f44e8aadb0
MSI 1.3 (D-377) installed the loader under Program Files, where nothing removed it: a customer found the file on every device. Everything of ours lives under ProgramData. - Package.wxs 1.4.0: the loader copy goes back to <base>\Msi (new component GUID); the deferred SYSTEM action, started in System32, reads the copy once, checks our signature and the publisher pin on those bytes and runs those bytes from memory, so a file a user planted at that path leads to nothing and no handle keeps the installer from removing the copy. Every bracket and brace is escaped for the Windows Installer formatter. - Install-AutopilotMonitor.ps1 2.9: Remove-MsiTransportFolder removes the copy in the agent-present branch (install and skip clear the base already) and an agent folder that is then empty; Remove-LegacyMsiLoaderFolder removes MSI 1.3's folder under Program Files in every outcome while devices still enroll with 1.3. - Tests: installer unit tests for both functions; the loader's MSI contract; the harness asserts after every run that nothing exists outside ProgramData, runs the MSI 1.4 action read from Package.wxs (valid, foreign, unsigned, changed; install, skip, marker only, agent present) and expects MSI 1.3's folder gone; BootstrapContractTests pin the directory chain, the publisher pin, the escapes and the working directory. - build-msi.yml: smoke job installs the built MSI on windows-2022/2025 with the deployment marker set and expects nothing under ProgramData or Program Files, then uninstalls. - internal: D-384, footprint doc, plan, lessons, backlog. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>