If your goal is to understand Windows PE boot files, here are the best official technical references:

| Document | Link | |----------|------| | Windows PE technical overview | https://learn.microsoft.com/en-us/windows-hardware/manufacture/desktop/winpe-intro | | WinPE: Create bootable media | https://learn.microsoft.com/en-us/windows-hardware/manufacture/desktop/winpe-create-usb-bootable-drive | | WinPE component reference | https://learn.microsoft.com/en-us/windows-hardware/manufacture/desktop/winpe-add-packages | | Windows ADK download | https://learn.microsoft.com/en-us/windows-hardware/get-started/adk-install | | Boot files (bootmgr, BCD, winload) | https://learn.microsoft.com/en-us/windows-hardware/manufacture/desktop/boot-process |

If all else fails and you only need basic boot files (not the full deployment tools), modern Windows 10/11 already includes a WinPE-like environment called WinRE. You can access it via reagentc /info or create a recovery drive without ever needing this specific MSI.

windows pe boot files -onecoreuap--x86-en-us.msi

Conclusion: This is almost certainly not a public release file. It may come from: