Remove CoClass usages from System.Windows.Forms

src/System.Windows.Forms.Primitives/src/Interop/Interop.CLSID.cs

@@ -0,0 +1,17 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+
+internal partial class Interop
+{
+    internal static class CLSID
+    {
+        // C0B4E2F3-BA21-4773-8DBA-335EC946EB8B
+        internal static Guid FileSaveDialog = new Guid(0xC0B4E2F3, 0xBA21, 0x4773, 0x8D, 0xBA, 0x33, 0x5E, 0xC9, 0x46, 0xEB, 0x8B);
+
+        // DC1C5A9C-E88A-4DDE-A5A1-60F82A20AEF7
+        internal static Guid FileOpenDialog = new Guid(0xDC1C5A9C, 0xE88A, 0x4DDE, 0xA5, 0xA1, 0x60, 0xF8, 0x2A, 0x20, 0xAE, 0xF7);
+    }
+}

src/System.Windows.Forms/src/System/Windows/Forms/FolderBrowserDialog.cs

@@ -205,12 +205,23 @@ protected override bool RunDialog(IntPtr hWndOwner)
 
         private bool TryRunDialogVista(IntPtr owner, out bool returnValue)
         {
-            OpenFileDialog.NativeFileOpenDialog dialog;
+            IFileOpenDialog dialog;
             try
             {
                 // Creating the Vista dialog can fail on Windows Server Core, even if the
                 // Server Core App Compatibility FOD is installed.
-                dialog = new OpenFileDialog.NativeFileOpenDialog();
+                HRESULT hr = Ole32.CoCreateInstance(
+                    ref CLSID.FileOpenDialog,
+                    IntPtr.Zero,
+                    Ole32.CLSCTX.INPROC_SERVER | Ole32.CLSCTX.LOCAL_SERVER | Ole32.CLSCTX.REMOTE_SERVER,
+                    ref NativeMethods.ActiveX.IID_IUnknown,
+                    out object obj);
+                if (!hr.Succeeded())
+                {
+                    Marshal.ThrowExceptionForHR((int)hr);
+                }
+
+                dialog = (IFileOpenDialog)obj;
             }
             catch (COMException)
             {

src/System.Windows.Forms/src/System/Windows/Forms/OpenFileDialog.cs

@@ -6,6 +6,7 @@
 
 using System.ComponentModel;
 using System.IO;
+using System.Runtime.InteropServices;
 using static Interop;
 using static Interop.Shell32;
 
@@ -139,7 +140,21 @@ private protected override string[] ProcessVistaFiles(IFileDialog dialog)
             }
         }
 
-        private protected override IFileDialog CreateVistaDialog() => new NativeFileOpenDialog();
+        private protected override IFileDialog CreateVistaDialog()
+        {
+            HRESULT hr = Ole32.CoCreateInstance(
+                ref CLSID.FileOpenDialog,
+                IntPtr.Zero,
+                Ole32.CLSCTX.INPROC_SERVER | Ole32.CLSCTX.LOCAL_SERVER | Ole32.CLSCTX.REMOTE_SERVER,
+                ref NativeMethods.ActiveX.IID_IUnknown,
+                out object obj);
+            if (!hr.Succeeded())
+            {
+                Marshal.ThrowExceptionForHR((int)hr);
+            }
+
+            return (IFileOpenDialog)obj;
+        }
 
         [Browsable(false)]
         [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]

src/System.Windows.Forms/src/System/Windows/Forms/SaveFileDialog.cs

@@ -6,6 +6,7 @@
 
 using System.ComponentModel;
 using System.IO;
+using System.Runtime.InteropServices;
 using static Interop;
 using static Interop.Shell32;
 
@@ -151,6 +152,20 @@ private protected override string[] ProcessVistaFiles(IFileDialog dialog)
             return new string[] { GetFilePathFromShellItem(item) };
         }
 
-        private protected override IFileDialog CreateVistaDialog() => new NativeFileSaveDialog();
+        private protected override IFileDialog CreateVistaDialog()
+        {
+            HRESULT hr = Ole32.CoCreateInstance(
+                ref CLSID.FileSaveDialog,
+                IntPtr.Zero,
+                Ole32.CLSCTX.INPROC_SERVER | Ole32.CLSCTX.LOCAL_SERVER | Ole32.CLSCTX.REMOTE_SERVER,
+                ref NativeMethods.ActiveX.IID_IUnknown,
+                out object obj);
+            if (!hr.Succeeded())
+            {
+                Marshal.ThrowExceptionForHR((int)hr);
+            }
+
+            return (IFileSaveDialog)obj;
+        }
     }
 }