Update the Windows install.

windows/resources/expand-zip.ps1

@@ -0,0 +1,17 @@
+Function Expand-ZIP([string]$filename) {
+	#Extract archive
+	if ($PSVersionTable.PSVersion.Major -ge 5) {
+		Expand-Archive $filename -DestinationPath .
+	}
+	elseif ( [System.Reflection.Assembly]::LoadWithPartialName("System.IO.Compression.FileSystem") ) {
+		$path = Get-Location
+		[System.IO.Compression.ZipFile]::ExtractToDirectory("$path\$filename",$path)
+	}
+	else {
+		#Check if 7zip is installed and install it if needed
+		. .\resources\install-7zip.ps1
+		Install-7zip
+		#Extract all files
+		Start-Process "c:\Program Files\7-Zip\7z.exe" "e -y $filename"
+	}
+}