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build/scripts/UpdateAppxManifestVersion.ps1

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+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License.
+
+<#
+.SYNOPSIS
+    Updates the version number in an AppxManifest file.
+
+.PARAMETER AppxManifest
+    The path to the AppxManifest file.
+
+.PARAMETER Version
+    The version number to write into the file.
+
+.EXAMPLE
+    Update-AppxManifestVersion -AppxManifest "C:\App\Package.appxmanifest" -Version "3.2.1.0"
+#>
+param(
+    [ValidateScript({Test-Path $_ -PathType 'Leaf'})]
+    [Parameter(Mandatory)]
+    [string]
+    $AppxManifest,
+
+    [ValidateScript({[version]$_})]
+    [Parameter(Mandatory)]
+    [string]
+    $Version
+)
+
+$xmlDoc = [XML](Get-Content $AppxManifest)
+$xmlDoc.Package.Identity.setAttribute("Version", $Version);
+$xmlDoc.Save($AppxManifest)