diff --git a/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/LibMuPdf.cs b/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/LibMuPdf.cs
index 383243e..5ec9f01 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/LibMuPdf.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/LibMuPdf.cs
@@ -102,14 +102,6 @@ namespace QuickLook.Plugin.PDFViewer
             }
         }
 
-        internal struct NativePage
-        {
-            public Matrix Ctm;
-            public Rectangle MediaBox;
-            public int Rotate;
-        }
-
-
         internal class NativeMethods
         {
             private const uint FZ_STORE_DEFAULT = 256 << 20;
diff --git a/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/ViewerPanel.xaml.cs b/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/ViewerPanel.xaml.cs
index 7e44e2e..4077980 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/ViewerPanel.xaml.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/ViewerPanel.xaml.cs
@@ -12,12 +12,14 @@ namespace QuickLook.Plugin.VideoViewer
     /// </summary>
     public partial class ViewerPanel : UserControl, IDisposable
     {
-        private ContextObject _context;
+        private readonly ContextObject _context;
 
         public ViewerPanel(ContextObject context)
         {
             InitializeComponent();
 
+            _context = context;
+
             buttonPlayPause.MouseLeftButtonUp += TogglePlayPause;
 
             mediaElement.PropertyChanged += ChangePlayPauseButton;
diff --git a/QuickLook/ViewWindowManager.cs b/QuickLook/ViewWindowManager.cs
index c0506f4..e5dc39b 100644
--- a/QuickLook/ViewWindowManager.cs
+++ b/QuickLook/ViewWindowManager.cs
@@ -81,7 +81,9 @@ namespace QuickLook
                     throw;
                 }
             }
+#pragma warning disable 1058
             catch // Catch SEH exceptions here.
+#pragma warning restore 1058
             {
                 _viewWindow.Close();