Fix usage of ErrorFallbackBinding.

src/Main/SharpDevelop/SharpDevelop.csproj

@@ -202,6 +202,7 @@
     <Compile Include="Workbench\DisplayBinding\AutoDetectDisplayBinding.cs" />
     <Compile Include="Workbench\DisplayBinding\DisplayBindingDoozer.cs" />
     <Compile Include="Workbench\DisplayBinding\DisplayBindingService.cs" />
+    <Compile Include="Workbench\DisplayBinding\ErrorFallbackBinding.cs" />
     <Compile Include="Workbench\DisplayBinding\OpenWithDialog.cs" />
     <Compile Include="Workbench\DisplayBinding\OpenWithDialog.Designer.cs">
       <DependentUpon>OpenWithDialog.cs</DependentUpon>

src/Main/SharpDevelop/Workbench/DisplayBinding/AutoDetectDisplayBinding.cs

@@ -68,7 +68,7 @@ namespace ICSharpCode.SharpDevelop.Workbench
 			}
 			
 			if (bestMatch == null)
-				return null;
+				return ErrorFallbackBinding.CouldNotFindDisplayBindingFor(file.FileName).CreateContentForFile(file);
 			
 			return bestMatch.Binding.CreateContentForFile(file);
 		}

src/Main/SharpDevelop/Workbench/DisplayBinding/ErrorFallbackBinding.cs

@@ -0,0 +1,59 @@
+// Copyright (c) 2014 AlphaSierraPapa for the SharpDevelop Team
+// 
+// Permission is hereby granted, free of charge, to any person obtaining a copy of this
+// software and associated documentation files (the "Software"), to deal in the Software
+// without restriction, including without limitation the rights to use, copy, modify, merge,
+// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
+// to whom the Software is furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in all copies or
+// substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
+// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+
+using System;
+using System.IO;
+using ICSharpCode.Core;
+
+namespace ICSharpCode.SharpDevelop.Workbench
+{
+	sealed class ErrorFallbackBinding : IDisplayBinding
+	{
+		public static ErrorFallbackBinding CouldNotFindDisplayBindingFor(FileName fileName)
+		{
+			return new ErrorFallbackBinding("Could not find any display binding for " + fileName.GetFileName());
+		}
+		
+		string errorMessage;
+			
+		public ErrorFallbackBinding(string errorMessage)
+		{
+			this.errorMessage = errorMessage;
+		}
+			
+		public bool CanCreateContentForFile(FileName fileName)
+		{
+			return true;
+		}
+			
+		public IViewContent CreateContentForFile(OpenedFile file)
+		{
+			return new SimpleViewContent(errorMessage) { TitleName = file.FileName.GetFileName() };
+		}
+			
+		public bool IsPreferredBindingForFile(FileName fileName)
+		{
+			return false;
+		}
+		
+		public double AutoDetectFileContent(FileName fileName, Stream fileContent, string detectedMimeType)
+		{
+			return double.NegativeInfinity;
+		}
+	}
+}

src/Main/SharpDevelop/Workbench/FileService.cs

@@ -311,7 +311,7 @@ namespace ICSharpCode.SharpDevelop.Workbench
 		{
 			return OpenFile(fileName, true);
 		}
-		
+
 		/// <inheritdoc/>
 		public IViewContent OpenFile(FileName fileName, bool switchToOpenedView)
 		{
@@ -328,7 +328,7 @@ namespace ICSharpCode.SharpDevelop.Workbench
 			IDisplayBinding binding = SD.DisplayBindingService.GetBindingPerFileName(fileName);
 			
 			if (binding == null) {
-				binding = new ErrorFallbackBinding("Could not find any display binding for " + Path.GetFileName(fileName));
+				binding = ErrorFallbackBinding.CouldNotFindDisplayBindingFor(fileName);
 			}
 			if (FileUtility.ObservedLoad(new NamedFileOperationDelegate(new LoadFileWrapper(binding, switchToOpenedView).Invoke), fileName) == FileOperationResult.OK) {
 				RecentOpen.AddRecentFile(fileName);
@@ -438,36 +438,6 @@ namespace ICSharpCode.SharpDevelop.Workbench
 			return null;
 		}
 		
-		sealed class ErrorFallbackBinding : IDisplayBinding
-		{
-			string errorMessage;
-			
-			public ErrorFallbackBinding(string errorMessage)
-			{
-				this.errorMessage = errorMessage;
-			}
-			
-			public bool CanCreateContentForFile(FileName fileName)
-			{
-				return true;
-			}
-			
-			public IViewContent CreateContentForFile(OpenedFile file)
-			{
-				return new SimpleViewContent(errorMessage) { TitleName = Path.GetFileName(file.FileName) };
-			}
-			
-			public bool IsPreferredBindingForFile(FileName fileName)
-			{
-				return false;
-			}
-			
-			public double AutoDetectFileContent(FileName fileName, Stream fileContent, string detectedMimeType)
-			{
-				return double.NegativeInfinity;
-			}
-		}
-		
 		/// <inheritdoc/>
 		public IViewContent JumpToFilePosition(FileName fileName, int line, int column)
 		{