diff --git a/ILSpy/AssemblyList.cs b/ILSpy/AssemblyList.cs
index 6fb33acb0..7a1cd6bf8 100644
--- a/ILSpy/AssemblyList.cs
+++ b/ILSpy/AssemblyList.cs
@@ -42,6 +42,7 @@ namespace ICSharpCode.ILSpy
 		bool dirty;
 		
 		internal readonly ConcurrentDictionary<string, LoadedAssembly> assemblyLookupCache = new ConcurrentDictionary<string, LoadedAssembly>();
+		internal readonly ConcurrentDictionary<string, LoadedAssembly> winRTMetadataLookupCache = new ConcurrentDictionary<string, LoadedAssembly>();
 		
 		/// <summary>
 		/// The assemblies in this list.
@@ -103,7 +104,7 @@ namespace ICSharpCode.ILSpy
 		
 		void Assemblies_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
 		{
-			assemblyLookupCache.Clear();
+			ClearCache();
 			// Whenever the assembly list is modified, mark it as dirty
 			// and enqueue a task that saves it once the UI has finished modifying the assembly list.
 			if (!dirty) {
@@ -114,12 +115,18 @@ namespace ICSharpCode.ILSpy
 						delegate {
 							dirty = false;
 							AssemblyListManager.SaveList(this);
-							assemblyLookupCache.Clear();
+							ClearCache();
 						})
 				);
 			}
 		}
 		
+		internal void ClearCache()
+		{
+			assemblyLookupCache.Clear();
+			winRTMetadataLookupCache.Clear();
+		}
+		
 		/// <summary>
 		/// Opens an assembly from disk.
 		/// Returns the existing assembly node if it is already loaded.
diff --git a/ILSpy/Languages/Language.cs b/ILSpy/Languages/Language.cs
index 708b0fd3c..56eb85561 100644
--- a/ILSpy/Languages/Language.cs
+++ b/ILSpy/Languages/Language.cs
@@ -127,7 +127,12 @@ namespace ICSharpCode.ILSpy
 		public virtual void DecompileAssembly(LoadedAssembly assembly, ITextOutput output, DecompilationOptions options)
 		{
 			WriteCommentLine(output, assembly.FileName);
-			WriteCommentLine(output, assembly.AssemblyDefinition.FullName);
+			var name = assembly.AssemblyDefinition.Name;
+			if ((name.Attributes & (AssemblyAttributes)0x0200) != 0) {
+				WriteCommentLine(output, name.Name + " [WinRT]");
+			} else {
+				WriteCommentLine(output, name.FullName);
+			}
 		}
 
 		public virtual void WriteCommentLine(ITextOutput output, string comment)
diff --git a/ILSpy/LoadedAssembly.cs b/ILSpy/LoadedAssembly.cs
index c8ffa8165..ffbea4d53 100644
--- a/ILSpy/LoadedAssembly.cs
+++ b/ILSpy/LoadedAssembly.cs
@@ -135,7 +135,7 @@ namespace ICSharpCode.ILSpy
 					disposed = true;
 					assemblyLoadDisableCount--;
 					// clear the lookup cache since we might have stored the lookups failed due to DisableAssemblyLoad()
-					MainWindow.Instance.CurrentAssemblyList.assemblyLookupCache.Clear();
+					MainWindow.Instance.CurrentAssemblyList.ClearCache();
 				}
 			}
 		}
@@ -151,13 +151,13 @@ namespace ICSharpCode.ILSpy
 			
 			public AssemblyDefinition Resolve(AssemblyNameReference name)
 			{
-				var node = parent.LookupReferencedAssembly(name.FullName);
+				var node = parent.LookupReferencedAssembly(name);
 				return node != null ? node.AssemblyDefinition : null;
 			}
 			
 			public AssemblyDefinition Resolve(AssemblyNameReference name, ReaderParameters parameters)
 			{
-				var node = parent.LookupReferencedAssembly(name.FullName);
+				var node = parent.LookupReferencedAssembly(name);
 				return node != null ? node.AssemblyDefinition : null;
 			}
 			
@@ -179,6 +179,17 @@ namespace ICSharpCode.ILSpy
 			return new MyAssemblyResolver(this);
 		}
 		
+		public LoadedAssembly LookupReferencedAssembly(AssemblyNameReference name)
+		{
+			if (name == null)
+				throw new ArgumentNullException("name");
+			if ((name.Attributes & (AssemblyAttributes)0x0200) != 0) {
+				return assemblyList.winRTMetadataLookupCache.GetOrAdd(name.Name, LookupWinRTMetadata);
+			} else {
+				return assemblyList.assemblyLookupCache.GetOrAdd(name.FullName, LookupReferencedAssemblyInternal);
+			}
+		}
+		
 		public LoadedAssembly LookupReferencedAssembly(string fullName)
 		{
 			return assemblyList.assemblyLookupCache.GetOrAdd(fullName, LookupReferencedAssemblyInternal);
@@ -214,6 +225,27 @@ namespace ICSharpCode.ILSpy
 			}
 		}
 		
+		LoadedAssembly LookupWinRTMetadata(string name)
+		{
+			foreach (LoadedAssembly asm in assemblyList.GetAssemblies()) {
+				if (asm.AssemblyDefinition != null && name.Equals(asm.AssemblyDefinition.Name.Name, StringComparison.OrdinalIgnoreCase))
+					return asm;
+			}
+			if (assemblyLoadDisableCount > 0)
+				return null;
+			if (!App.Current.Dispatcher.CheckAccess()) {
+				// Call this method on the GUI thread.
+				return (LoadedAssembly)App.Current.Dispatcher.Invoke(DispatcherPriority.Normal, new Func<string, LoadedAssembly>(LookupWinRTMetadata), name);
+			}
+			
+			string file = Path.Combine(Environment.SystemDirectory, "WinMetadata", name + ".winmd");
+			if (File.Exists(file)) {
+				return assemblyList.OpenAssembly(file);
+			} else {
+				return null;
+			}
+		}
+		
 		public Task ContinueWhenLoaded(Action<Task<AssemblyDefinition>> onAssemblyLoaded, TaskScheduler taskScheduler)
 		{
 			return this.assemblyTask.ContinueWith(onAssemblyLoaded, taskScheduler);
diff --git a/ILSpy/MainWindow.xaml.cs b/ILSpy/MainWindow.xaml.cs
index b92d84a24..a63af47d9 100644
--- a/ILSpy/MainWindow.xaml.cs
+++ b/ILSpy/MainWindow.xaml.cs
@@ -515,7 +515,7 @@ namespace ICSharpCode.ILSpy
 		{
 			e.Handled = true;
 			OpenFileDialog dlg = new OpenFileDialog();
-			dlg.Filter = ".NET assemblies|*.dll;*.exe|All files|*.*";
+			dlg.Filter = ".NET assemblies|*.dll;*.exe;*.winmd|All files|*.*";
 			dlg.Multiselect = true;
 			dlg.RestoreDirectory = true;
 			if (dlg.ShowDialog() == true) {
diff --git a/ILSpy/TreeNodes/AssemblyReferenceTreeNode.cs b/ILSpy/TreeNodes/AssemblyReferenceTreeNode.cs
index 13704127d..d9d33b755 100644
--- a/ILSpy/TreeNodes/AssemblyReferenceTreeNode.cs
+++ b/ILSpy/TreeNodes/AssemblyReferenceTreeNode.cs
@@ -63,7 +63,7 @@ namespace ICSharpCode.ILSpy.TreeNodes
 		{
 			var assemblyListNode = parentAssembly.Parent as AssemblyListTreeNode;
 			if (assemblyListNode != null) {
-				assemblyListNode.Select(assemblyListNode.FindAssemblyNode(parentAssembly.LoadedAssembly.LookupReferencedAssembly(r.FullName)));
+				assemblyListNode.Select(assemblyListNode.FindAssemblyNode(parentAssembly.LoadedAssembly.LookupReferencedAssembly(r)));
 				e.Handled = true;
 			}
 		}
@@ -72,7 +72,7 @@ namespace ICSharpCode.ILSpy.TreeNodes
 		{
 			var assemblyListNode = parentAssembly.Parent as AssemblyListTreeNode;
 			if (assemblyListNode != null) {
-				var refNode = assemblyListNode.FindAssemblyNode(parentAssembly.LoadedAssembly.LookupReferencedAssembly(r.FullName));
+				var refNode = assemblyListNode.FindAssemblyNode(parentAssembly.LoadedAssembly.LookupReferencedAssembly(r));
 				if (refNode != null) {
 					AssemblyDefinition asm = refNode.LoadedAssembly.AssemblyDefinition;
 					if (asm != null) {
@@ -85,7 +85,11 @@ namespace ICSharpCode.ILSpy.TreeNodes
 		
 		public override void Decompile(Language language, ITextOutput output, DecompilationOptions options)
 		{
-			language.WriteCommentLine(output, r.FullName);
+			if ((r.Attributes & (AssemblyAttributes)0x0200) != 0) {
+				language.WriteCommentLine(output, r.Name + " [WinRT]");
+			} else {
+				language.WriteCommentLine(output, r.FullName);
+			}
 		}
 	}
 }