PowerShell can run inside WinPE environments. If you’d like to detect whether your PowerShell script runs inside a WinPE environment, you can simply check whether a special registry key exists:
function Test-WinPE { return Test-Path -Path Registry::HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlset\Control\MiniNT }
This function returns $true if you are within a WinPE environment.
