Move Process.Start-calls to a central helper method. This ensures we do not crash if there's an OS configuration error, missing browser, whatever.

ILSpy/AboutPage.cs

@@ -167,7 +167,7 @@ namespace ICSharpCode.ILSpy
 					button.Content = "Download";
 					button.Cursor = Cursors.Arrow;
 					button.Click += delegate {
-						Process.Start(availableVersion.DownloadUrl);
+						MainWindow.OpenLink(availableVersion.DownloadUrl);
 					};
 					stackPanel.Children.Add(button);
 				}

ILSpy/MainWindow.xaml.cs

@@ -418,7 +418,7 @@ namespace ICSharpCode.ILSpy
 		void downloadOrCheckUpdateButtonClick(object sender, RoutedEventArgs e)
 		{
 			if (updateAvailableDownloadUrl != null) {
-				Process.Start(updateAvailableDownloadUrl);
+				MainWindow.OpenLink(updateAvailableDownloadUrl);
 			} else {
 				updatePanel.Visibility = Visibility.Collapsed;
 				AboutPage.CheckForUpdatesAsync(spySettings ?? ILSpySettings.Load())
@@ -654,6 +654,13 @@ namespace ICSharpCode.ILSpy
 				SelectNode(treeNode);
 			} else if (reference is Mono.Cecil.Cil.OpCode) {
 				string link = "http://msdn.microsoft.com/library/system.reflection.emit.opcodes." + ((Mono.Cecil.Cil.OpCode)reference).Code.ToString().ToLowerInvariant() + ".aspx";
+				OpenLink(link);
+			}
+			return decompilationTask;
+		}
+
+		public static void OpenLink(string link)
+		{
 			try {
 				Process.Start(link);
 #pragma warning disable RECS0022 // A catch clause that catches System.Exception and has an empty body
@@ -663,8 +670,6 @@ namespace ICSharpCode.ILSpy
 				// just ignore all of them.
 			}
 		}
-			return decompilationTask;
-		}
 		#endregion
 		
 		#region Open/Refresh

ILSpy/TreeNodes/SearchMsdnContextMenuEntry.cs

@@ -106,7 +106,7 @@ namespace ICSharpCode.ILSpy.TreeNodes
 
 			address = address.ToLower();
 			if (!string.IsNullOrEmpty(address))
-				Process.Start(address);
+				MainWindow.OpenLink(address);
 		}
 	}
 }