Windows Preinstallation Environment (WinPE) is a legitimate, minimal operating system used by IT professionals to deploy Windows, recover data, or run diagnostics. Microsoft provides WinPE through the Windows Assessment and Deployment Kit (ADK).
Custom ISOs created by independent developers are . While Ghost Spectre has a large community of users who trust the builds, there is always an inherent risk when installing an operating system from an unofficial source. WIN10.PRO.AIO.U18.X64.-WPE-.ISO