Add script to aid in expanding .MIG files.

Author: Nick Rodriguez

Expand-UsmtMig.ps1

@@ -0,0 +1,58 @@
+[CmdletBinding()]
+
+param(
+    [Parameter(Mandatory = $false)]
+    [ValidateScript( {
+            if ((Get-Item $_).Extension -ne '.MIG') {
+                throw "[$_] is not a USMT migration file (mig)."
+            }
+            else { $true }
+        })]
+    [string]$MigPath
+)
+
+$CurrentID = [System.Security.Principal.WindowsIdentity]::GetCurrent()
+$WindowsPrincipal = New-Object System.Security.Principal.WindowsPrincipal($CurrentID)
+$AdminRole = [System.Security.Principal.WindowsBuiltInRole]::Administrator
+
+if (-not $WindowsPrincipal.IsInRole($AdminRole)) {
+    $NewProcess = New-Object System.Diagnostics.ProcessStartInfo 'PowerShell'
+    $NewProcess.Arguments = $MyInvocation.MyCommand.Definition
+    $NewProcess.Verb = 'RunAs'
+    [System.Diagnostics.Process]::Start($NewProcess)
+
+    exit
+}
+
+# Get USMT binary path according to OS architecture
+$arch = (Get-WmiObject Win32_OperatingSystem).OSArchitecture
+if ($arch -match '64') {
+    $usmtPath = "$PSScriptRoot\USMT\amd64"
+} elseif ($arch -match '86') {
+    $usmtPath = "$PSScriptRoot\USMT\x86"
+}
+else {
+    $usmtPath = "$PSScriptRoot\USMT\arm64"
+}
+
+if ([string]::IsNullOrEmpty($MigPath)) {
+    [System.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms") | Out-Null
+
+    $OpenFileDialog = New-Object System.Windows.Forms.OpenFileDialog
+    $OpenFileDialog.Title = "Select a USMT migration file to expand"
+    $OpenFileDialog.Filter = "MIG (*.MIG)| *.MIG"
+    $OpenFileDialog.ShowHelp = $true
+    $OpenFileDialog.ShowDialog() | Out-Null
+    $MigPath = Get-Item $OpenFileDialog.FileName
+}
+
+$destination = Split-Path $MigPath -Parent
+
+try {
+    Start-Process -FilePath "$usmtPath\usmtutils.exe" -ArgumentList "/extract `"$MigPath`" `"$destination`"" -Wait -NoNewWindow
+}
+catch {
+    Write-Host $_.Exception.Message -ForegroundColor Red
+}
+
+pause