removed dependency from ookii dialogs and implemented using Windows Code pack.

src/Perspex.Controls/SystemDialog.cs

@@ -5,10 +5,14 @@ using Perspex.Controls.Platform;
 
 namespace Perspex.Controls
 {
-    public abstract class FileDialog : SystemDialog
+    public abstract class FileDialog : FileSystemDialog
     {
         public List<FileDialogFilter> Filters { get; set; } = new List<FileDialogFilter>();
-        public string InitialFileName { get; set; }
+        public string InitialFileName { get; set; }        
+    }
+
+    public abstract class FileSystemDialog : SystemDialog
+    {
         public string InitialDirectory { get; set; }
     }
 
@@ -30,7 +34,7 @@ namespace Perspex.Controls
             => PerspexLocator.Current.GetService<ISystemDialogImpl>().ShowFileDialogAsync(this, window?.PlatformImpl);
     }
 
-    public class OpenFolderDialog : SystemDialog
+    public class OpenFolderDialog : FileSystemDialog
     {
         public Task<string> ShowAsync(Window window = null)
                => PerspexLocator.Current.GetService<ISystemDialogImpl>().ShowFolderDialogAsync(this, window?.PlatformImpl);

src/Windows/Perspex.Win32/Perspex.Win32.csproj

@@ -38,8 +38,16 @@
     <NoWarn>CS1591</NoWarn>
   </PropertyGroup>
   <ItemGroup>
-    <Reference Include="Ookii.Dialogs.Wpf, Version=1.0.0.0, Culture=neutral, PublicKeyToken=0c15020868fd6249, processorArchitecture=MSIL">
-      <HintPath>..\..\..\packages\Ookii.Dialogs.1.0\lib\net35\Ookii.Dialogs.Wpf.dll</HintPath>
+    <Reference Include="Microsoft.WindowsAPICodePack, Version=1.1.0.0, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>..\..\..\packages\Microsoft.WindowsAPICodePack-Core.1.1.0.2\lib\Microsoft.WindowsAPICodePack.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="Microsoft.WindowsAPICodePack.Shell, Version=1.1.0.0, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>..\..\..\packages\Microsoft.WindowsAPICodePack-Shell.1.1.0.0\lib\Microsoft.WindowsAPICodePack.Shell.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="Microsoft.WindowsAPICodePack.ShellExtensions, Version=1.1.0.0, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>..\..\..\packages\Microsoft.WindowsAPICodePack-Shell.1.1.0.0\lib\Microsoft.WindowsAPICodePack.ShellExtensions.dll</HintPath>
       <Private>True</Private>
     </Reference>
     <Reference Include="System" />

src/Windows/Perspex.Win32/SystemDialogImpl.cs

@@ -10,7 +10,7 @@ using Perspex.Controls;
 using Perspex.Controls.Platform;
 using Perspex.Platform;
 using Perspex.Win32.Interop;
-using Ookii.Dialogs.Wpf;
+using Microsoft.WindowsAPICodePack.Dialogs;
 
 namespace Perspex.Win32
 {
@@ -131,14 +131,33 @@ namespace Perspex.Win32
         }
 
         public Task<string> ShowFolderDialogAsync(OpenFolderDialog dialog, IWindowImpl parent)
-        {
-            VistaFolderBrowserDialog fbd = new VistaFolderBrowserDialog();
-
+        {                                
             return Task.Factory.StartNew(() =>
             {
-                fbd.ShowDialog();
+                var dlg = new CommonOpenFileDialog();
+                dlg.Title = dialog.Title;
+                dlg.IsFolderPicker = true;
+                dlg.InitialDirectory = dialog.InitialDirectory;
+
+                dlg.AddToMostRecentlyUsedList = false;
+                dlg.AllowNonFileSystemItems = false;
+                
+                dlg.EnsureFileExists = true;
+                dlg.EnsurePathExists = true;
+                dlg.EnsureReadOnly = false;
+                dlg.EnsureValidNames = true;
+                dlg.Multiselect = false;
+                dlg.ShowPlacesList = true;
+                dlg.DefaultFileName = "";
+
+                string result = string.Empty;
+
+                if (dlg.ShowDialog() == CommonFileDialogResult.Ok)
+                {
+                    result = dlg.FileName;                    
+                }
 
-                return fbd.SelectedPath;
+                return result;
             });
         }
     }

src/Windows/Perspex.Win32/packages.config

@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="Ookii.Dialogs" version="1.0" targetFramework="net45" />
+  <package id="Microsoft.WindowsAPICodePack-Core" version="1.1.0.2" targetFramework="net45" />
+  <package id="Microsoft.WindowsAPICodePack-Shell" version="1.1.0.0" targetFramework="net45" />
   <package id="Rx-Core" version="2.2.5" targetFramework="net45" />
   <package id="Rx-Interfaces" version="2.2.5" targetFramework="net45" />
   <package id="Rx-Linq" version="2.2.5" targetFramework="net45" />