Start on new patch infrastructure

1 files changed, 2 insertions, 3 deletions

diff --git a/src/WixToolset.Core.WindowsInstaller/WindowsInstallerBackendFactory.cs b/src/WixToolset.Core.WindowsInstaller/WindowsInstallerBackendFactory.cs
index 173404d7..f9cf4492 100644
--- a/src/WixToolset.Core.WindowsInstaller/WindowsInstallerBackendFactory.cs
+++ b/src/WixToolset.Core.WindowsInstaller/WindowsInstallerBackendFactory.cs
@@ -1,11 +1,10 @@
-// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
 
 namespace WixToolset.Core.WindowsInstaller
 {
     using System;
     using System.IO;
     using WixToolset.Extensibility;
-    using WixToolset.Extensibility.Data;
 
     internal class WindowsInstallerBackendFactory : IBackendFactory
     {
@@ -16,7 +15,7 @@ namespace WixToolset.Core.WindowsInstaller
                 outputType = Path.GetExtension(outputFile);
             }
 
-            switch (outputType.ToLowerInvariant())
+            switch (outputType?.ToLowerInvariant())
             {
                 case "module":
                 case ".msm":