Unpack Sitecore Update Package

Sitecore.Support.Template.targets

<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
    <ItemGroup>

    </ItemGroup>
</Project>

Unpack-SitecoreUpdatePackage.ps1

param (
    $PackageName = "SC Hotfix 408137-1",
    $PackageDirectory = $PSScriptRoot,
    $UnpackDirectory = "$PackageDirectory\$PackageName",
	$TargetsTemplatePath = "$PackageDirectory\Sitecore.Support.Template.targets"
)



Remove-Item -Path $UnpackDirectory -Force -Recurse -ErrorAction Ignore
Remove-Item -Path "$PackageDirectory\lib" -Force -Recurse -ErrorAction Ignore
Remove-Item -Path "$PackageDirectory\build" -Force -Recurse -ErrorAction Ignore
Remove-Item -Path "$PackageDirectory\src" -Force -Recurse -ErrorAction Ignore

Expand-Archive "$PackageDirectory\$PackageName.zip" -DestinationPath $UnpackDirectory -Force
Rename-Item -Path "$UnpackDirectory\$PackageName.update" -NewName "$PackageName.zip"
Expand-Archive "$UnpackDirectory\$PackageName.zip" -DestinationPath $UnpackDirectory -Force
Expand-Archive "$UnpackDirectory\package.zip" -DestinationPath $UnpackDirectory -Force

Remove-Item -Path "$UnpackDirectory\package.zip" -Force

$folders = Get-ChildItem -Path $UnpackDirectory -Exclude "properties", "readme.txt", "*.zip" 
$dlls = $folders | Get-ChildItem -Filter *.dll  -Recurse | Select-Object -ExpandProperty VersionInfo

New-Item -Path $PackageDirectory -Name "lib" -ItemType "directory"

$doc = New-Object System.Xml.XmlDocument
$doc.Load($TargetsTemplatePath)
$ns = $doc.DocumentElement.NamespaceURI

[System.Xml.XmlNamespaceManager]$nsmgr = $doc.NameTable 
$nsmgr.AddNamespace("msb", "http://schemas.microsoft.com/developer/msbuild/2003")
$itemGroup = $doc.SelectSingleNode("//msb:Project/msb:ItemGroup", $nsmgr)

foreach ($dll in $dlls)
{
    $fileName = Split-Path $dll.FileName -leaf
    $assembly = $doc.CreateElement("SitecoreHotfixAssemblies", $ns)
    $assembly.SetAttribute("Include", $fileName)
    $name = $doc.CreateElement("Name", $ns)
    $name.InnerText = $fileName
    $assembly.AppendChild($name)

    $version = $doc.CreateElement("Version", $ns)
    $version.InnerText = $dll.FileVersion
    $assembly.AppendChild($version)

    $fileversion = $doc.CreateElement("FileVersion", $ns)
    $fileversion.InnerText = $dll.FileVersion
    $assembly.AppendChild($fileversion)

    $infoversion = $doc.CreateElement("InfoVersion", $ns)
    $infoversion.InnerText = $dll.ProductVersion
    $assembly.AppendChild($infoversion)

    $itemGroup.AppendChild($assembly)
    Copy-Item -Path $dll.FileName -Destination "$PackageDirectory\lib\$fileName"
}

New-Item -Path $PackageDirectory -Name "build" -ItemType "directory"

$doc.Save("$PackageDirectory\build\Sitecore.Support.targets")

New-Item -Path $PackageDirectory -Name "src" -ItemType "directory"
Copy-Item -Path "$PackageDirectory\$PackageName\addedfiles\*" -Exclude "bin" -Recurse -Destination "$PackageDirectory\src\"
Copy-Item -Path "$PackageDirectory\$PackageName\changedfiles\*" -Exclude "bin" -Recurse -Destination "$PackageDirectory\src\"
Remove-Item -Path "$UnpackDirectory" -Force