Update the Windows install.

windows/resources/install-webplatform.ps1

@@ -0,0 +1,37 @@
+Function Install-WebPlatform() {
+	#includes
+	. .\resources\get-file.ps1
+    . .\resources\get-cpu.ps1
+
+	#send message
+	if (Get-Installed-App "*Web Platform*") {
+		Write-Host "Web Platform Installer is already installed"
+		return
+	}
+
+	#download and install the web platform installer
+    if (-not (Test-Path "${env:ProgramFiles}\Microsoft\Web Platform Installer\WebPlatformInstaller.exe")) {
+        $url = "http://download.microsoft.com/download/F/4/2/F42AB12D-C935-4E65-9D98-4E56F9ACBC8E/wpilauncher.exe"
+        $filename = Get-File $url
+        Start-Process $filename -Wait
+    }
+    else {
+		Start-Process "C:\Program Files\Microsoft\Web Platform Installer\WebPlatformInstaller.exe" -Wait
+	}
+
+	# list available applications - All, Available
+	# WebpiCmd-x64.exe /list /listoption:Available
+
+    # install PHP 7.1 on IIS
+    if (-not (Test-Path "${env:ProgramFiles}\PHP\v7.1\php.exe")) {
+	    $cpu = Get-CPU
+	    if ($cpu -eq "x86") {
+	        $command = "WebpiCmd.exe /install /Products:PHP71 /AcceptEula"
+        }
+        else {
+	        $command = "WebpiCmd-x64.exe /install /Products:PHP71x64 /AcceptEula"
+        }
+        Start-Process $command -Wait
+    }
+
+}