diff --git a/PowerTools/WDKBatchBuild/README.md b/PowerTools/WDKBatchBuild/README.md
new file mode 100644
index 000000000..124528b95
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+++ b/PowerTools/WDKBatchBuild/README.md
@@ -0,0 +1,36 @@
+WDKBatchBuild
+
+JakobL@2025/11/19
+
+Build this repo in "batch mode" using multiple EWDKs. 
+
+Once batch build is complete you will find complete copies of built repo with generated artifacts ready for your favorite diff algorithm.
+
+Files:
+* WDKBatchBuild.ps1 <-- Main script. Change bottom part to refine functionality.
+* WDKBatchBuild_Internal.ps1. Auxillary function.
+
+Nifty Tricks:
+* Nifty lazy ISO file copy.  Only copies if necessary.
+* Nifty lazy ISO extraction.  Caches EWDKs.  Only extracts what is necessary.
+* Nifty NTFS Junction mount of each EWDK to same junction location, so that the EWDK Root is identical for each build.  This eliminates any output changes due to EWDK root.
+* Nifty trick to invoke build environment and build:
+  * Does following N times:
+    * Starts out in main PowerShell script
+    * Calls cmd script EWDK\BuildEnv\SetupBuildEnv.cmd to setup build environment
+    * Continuation into auxillary PowerShell script
+
+Warning:
+* Will run "clean -xdf" in root of repo thereby wiping out anything not checked in.
+* Make sure to check changes to this script in before running.
+
+Assumptions:
+* Requires new pwsh (rather than old powershell).
+* Hard coded in script WDKBatchBuild.ps1:
+  * Repo in D:\wds\wds1
+  * Input ISOs in D:\wds\ISOs
+  * Temporary EWDKs extracted to D:\wds\EWDKs
+  * Output runs in D:\wds\Runs
+
+Issues:
+* I suspect that occasionally among other the MSVC toolset's mspdbsrv does not terminate after runs.  Leaving active processes.  It seems this - much to my surprise - does not prevent removing the NTFS Junction (where as a recursive delete may fail).  Report if you see this sort of issue please.
diff --git a/PowerTools/WDKBatchBuild/WDKBatchBuild.ps1 b/PowerTools/WDKBatchBuild/WDKBatchBuild.ps1
new file mode 100644
index 000000000..cd5799a98
--- /dev/null
+++ b/PowerTools/WDKBatchBuild/WDKBatchBuild.ps1
@@ -0,0 +1,232 @@
+function Assert-Pwsh {
+    [CmdletBinding()]
+    param()
+
+    # Always log current edition and version
+    Write-Host "Current PowerShell Edition: $($PSVersionTable.PSEdition)"
+    Write-Host "Current PowerShell Version: $($PSVersionTable.PSVersion)"
+
+    # Check edition
+    if ($PSVersionTable.PSEdition -ne 'Core') {
+        throw "This script requires PowerShell (pwsh) Core edition. Current edition: $($PSVersionTable.PSEdition)"
+    }
+
+    # Optional: enforce minimum version (e.g., 7.0)
+    if ($PSVersionTable.PSVersion -lt [Version]'7.0') {
+        throw "This script requires PowerShell 7.0 or later. Current version: $($PSVersionTable.PSVersion)"
+    }
+}
+
+function Copy-IfMissingSizeTime {
+    [CmdletBinding()]
+    param(
+        [Parameter(Mandatory)][string]$Source,
+        [Parameter(Mandatory)][string]$Destination
+    )
+
+    Write-Host "Copy-IfMissingSizeTime $Source {"
+
+    $ErrorActionPreference = 'Stop'
+
+    # Normalize UNC long path (\\server\share\... -> \\?\UNC\server\share\...)
+    function To-LongUnc([string]$p) {
+        if ($p.StartsWith('\\')) {
+            # Strip leading \\ then rebuild
+            $trim = $p.TrimStart('\')
+            return "\\?\UNC\" + $trim
+        }
+        return $p
+    }
+
+    # Use long-path version for source if UNC; destination is local so normal path is fine
+    $srcPath = if ($Source.StartsWith('\\')) { To-LongUnc $Source } else { $Source }
+
+    # Validate source file
+    $srcItem = Get-Item -LiteralPath $srcPath -ErrorAction Stop
+    if ($srcItem.PSIsContainer) { throw "Source '$Source' is a directory; this helper is for single files." }
+
+    # Ensure destination directory exists
+
+    $destDir = Split-Path -LiteralPath $Destination
+    if ($destDir -and -not (Test-Path -LiteralPath $destDir)) {
+        New-Item -ItemType Directory -Path $destDir -Force | Out-Null
+    }
+
+    if (Test-Path -LiteralPath $Destination) {
+        $dstItem  = Get-Item -LiteralPath $Destination
+        $sameSize = ($srcItem.Length -eq $dstItem.Length)
+        $sameTime = ($srcItem.LastWriteTimeUtc -eq $dstItem.LastWriteTimeUtc)
+
+        if ($sameSize -and $sameTime) {
+            Write-Verbose "Skipping: destination matches source by size and timestamp."
+            Write-Host "Copy-IfMissingSizeTime $Source }"
+            return $false
+        }
+
+        # Overwrite if different
+        Copy-Item -LiteralPath $srcPath -Destination $Destination -Force
+        # Align timestamp (sometimes Copy-Item preserves; enforce to be sure)
+        (Get-Item -LiteralPath $Destination).LastWriteTimeUtc = $srcItem.LastWriteTimeUtc
+        Write-Host "Copy-IfMissingSizeTime $Source }"
+        return $true
+    }
+    else {
+        # Destination missing -> copy
+        Copy-Item -LiteralPath $srcPath -Destination $Destination -Force
+        (Get-Item -LiteralPath $Destination).LastWriteTimeUtc = $srcItem.LastWriteTimeUtc
+        Write-Host "Copy-IfMissingSizeTime $Source }"
+        return $true
+    }
+    Write-Host "Copy-IfMissingSizeTime $Source }"
+}
+
+
+function Copy-IsoContent {
+    [CmdletBinding()]
+    param(
+        [Parameter(Mandatory, Position = 0)]
+        [ValidateNotNullOrEmpty()]
+        [string] $IsoPath,
+
+        [Parameter(Mandatory, Position = 1)]
+        [ValidateNotNullOrEmpty()]
+        [string] $Destination
+    )
+
+    $ErrorActionPreference = 'Stop'
+
+    Write-Host "Copy-IsoContent $IsoPath {"
+
+    # Resolve paths
+    $isoFull = (Resolve-Path -LiteralPath $IsoPath).ProviderPath
+    $destFull = if (Test-Path -LiteralPath $Destination) {
+        (Resolve-Path -LiteralPath $Destination).ProviderPath
+    } else {
+        [IO.Path]::GetFullPath($Destination)
+    }
+
+    # Ensure destination exists
+    if (-not (Test-Path -LiteralPath $destFull)) {
+        New-Item -ItemType Directory -Path $destFull -Force | Out-Null
+    }
+
+    # Mount ISO
+    $diskImage = Mount-DiskImage -ImagePath $isoFull -PassThru
+    try {
+        # Get drive letter
+        $volume = Get-Volume -DiskImage $diskImage | Where-Object { $_.DriveLetter } | Select-Object -First 1
+        if (-not $volume) {
+            throw "Failed to determine a drive letter for mounted ISO: $isoFull"
+        }
+        $src = ($volume.DriveLetter + ':\')
+
+        # Build robocopy args (copy all, keep timestamps, avoid ACLs from ISO, clear R)
+        $args = @(
+            "$src",              # source
+            "`"$destFull`"",         # destination
+            '/E',                    # include empty directories
+            '/COPY:DAT',             # Data, Attr, Timestamps (avoid ACL/Owner from ISO)
+            '/DCOPY:DAT',            # preserve dir timestamps too
+            '/A-:R',                 # remove read-only on destination
+            '/R:2','/W:2',           # quick retry policy
+            '/MT:16',                # multithreaded copy
+            '/NP','/NFL','/NDL',     # quieter output
+            '/XJ'                    # ignore junctions
+        )
+
+        $proc = Start-Process -FilePath 'robocopy.exe' -ArgumentList $args -NoNewWindow -PassThru -Wait
+        $rc = $proc.ExitCode
+
+        # Robocopy: 0..7 are success-ish; >=8 is failure
+        if ($rc -ge 8) {
+            throw "Robocopy failed with exit code $rc."
+        }
+
+        Write-Host "Copy-IsoContent $IsoPath }"
+        # Also reflect exit code in $LASTEXITCODE for callers
+        Set-Variable -Name LASTEXITCODE -Value $rc -Scope Global
+        #return $rc
+        return
+    }
+    finally {
+        try {
+            Dismount-DiskImage -ImagePath $isoFull -ErrorAction Stop | Out-Null
+        } catch {
+            Write-Warning "Failed to unmount ISO '$isoFull': $($_.Exception.Message)"
+        }
+    }
+    Write-Host "Copy-IsoContent $IsoPath }"
+}
+
+function WithEWDK {
+    [CmdletBinding()]
+    param(
+        [Parameter(Mandatory, Position = 1)]
+        [ValidateNotNullOrEmpty()]
+        [string] $EWDK
+    )
+
+    $ErrorActionPreference = 'Stop'
+
+    Write-Host "WithEWDK $EWDK {"
+
+    git clean -xdf
+    git status --ignored
+
+    if (Test-Path -LiteralPath "D:\wds\EWDK") {
+        Write-Host "Removing old junction D:\wds\EWDK {"
+        # Remove-Item -Recurse -Force -ErrorAction Stop -LiteralPath "D:\wds\EWDK" 
+        Remove-Item -LiteralPath "D:\wds\EWDK" -ErrorAction Stop
+        Write-Host "Removing old junction D:\wds\EWDK }"
+    }
+    New-Item -ItemType Junction -Path "D:\wds\EWDK" -Target "D:\wds\EWDKs\$EWDK"
+    #robocopy /mir /nfl /ndl "D:\wds\EWDKs\$EWDK" "D:\wds\EWDK"
+
+    $CmdScriptPath = "D:\wds\EWDK\BuildEnv\SetupBuildEnv.cmd"
+
+    $pwshArgs = @(
+            '-NoLogo','-NoProfile',
+            '-ExecutionPolicy','Bypass',
+            '-File', 'D:\wds\wds1\PowerTools\WDKBatchBuild\WDKBatchBuild_Internal.ps1',
+            '-Phase','AfterCmd'
+        ) -join ' '
+
+    $cmdPayload = ('call "{0}" && pwsh {1} || exit /b %errorlevel%' -f $CmdScriptPath, $pwshArgs)
+
+    Write-Host "& $env:ComSpec /s /c $cmdPayload"
+    & $env:ComSpec /s /c $cmdPayload
+
+    robocopy /mir /nfl /ndl "." "D:\wds\Runs\$EWDK"
+
+    git clean -xdf
+    git status --ignored
+
+    Write-Host "Removing junction D:\wds\EWDK {"
+    Remove-Item -LiteralPath "D:\wds\EWDK" -ErrorAction Stop
+    Write-Host "Removing junction D:\wds\EWDK }"
+
+    Write-Host "WithEWDK $EWDK }"
+}
+
+Assert-Pwsh
+
+Set-StrictMode -Version Latest
+$ErrorActionPreference = 'Stop'
+
+cd D:\wds\wds1
+
+Write-Host "Copy-IsoContent {"
+Copy-IsoContent -IsoPath 'D:\wds\ISOs\EWDK_19041.685.201201-2105.iso' -Destination 'D:\wds\EWDKs\EWDK_19041.685.201201-2105'
+Copy-IsoContent -IsoPath 'D:\wds\ISOs\EWDK_19041.685.201201-2105.iso' -Destination 'D:\wds\EWDKs\EWDK_19041.685.201201-2105-copy'
+Copy-IsoContent -IsoPath 'D:\wds\ISOs\EWDK_19041.5738.250408-1639.iso' -Destination 'D:\wds\EWDKs\EWDK_19041.5738.250408-1639'
+Copy-IsoContent -IsoPath 'D:\wds\ISOs\EWDK_26100.1.240331-1435.iso' -Destination 'D:\wds\EWDKs\EWDK_26100.1.240331-1435'
+Copy-IsoContent -IsoPath 'D:\wds\ISOs\EWDK_26100.6725.250925-1604.iso' -Destination 'D:\wds\EWDKs\EWDK_26100.6725.250925-1604'
+Write-Host "Copy-IsoContent }"
+
+Write-Host "Build {"
+WithEWDK 'EWDK_19041.685.201201-2105'
+WithEWDK 'EWDK_19041.685.201201-2105-copy'
+WithEWDK 'EWDK_19041.5738.250408-1639'
+WithEWDK 'EWDK_26100.1.240331-1435'
+WithEWDK 'EWDK_26100.6725.250925-1604'
+Write-Host "Build }"
diff --git a/PowerTools/WDKBatchBuild/WDKBatchBuild_Internal.ps1 b/PowerTools/WDKBatchBuild/WDKBatchBuild_Internal.ps1
new file mode 100644
index 000000000..f80f36d23
--- /dev/null
+++ b/PowerTools/WDKBatchBuild/WDKBatchBuild_Internal.ps1
@@ -0,0 +1 @@
+.\build-AllSamples -Verbose -Samples '^tools.sdv.samples.sdv-faildriver-wdm' -Configurations 'Debug' -Platforms 'x64'