1 files changed, 28 insertions, 0 deletions
diff --git a/src/mscorlib/src/System/Runtime/Versioning/TargetFrameworkId.cs b/src/mscorlib/src/System/Runtime/Versioning/TargetFrameworkId.cs
new file mode 100644
index 0000000000..0a5e668a92
--- /dev/null
+++ b/src/mscorlib/src/System/Runtime/Versioning/TargetFrameworkId.cs
@@ -0,0 +1,28 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+/*============================================================
+**
+** Purpose: Describe the target framework of the application or AppDomain.
+**
+===========================================================*/
+using System;
+using System.Runtime.CompilerServices;
+
+namespace System.Runtime.Versioning
+{
+    // What type of .NET Framework was this application compiled against?
+    [FriendAccessAllowed]
+    internal enum TargetFrameworkId
+    {
+        NotYetChecked = 0,
+        Unrecognized = 1, // Unknown type, such as a new SKU (like watches or cars)
+        Unspecified = 2, // The TargetFrameworkAttribute was created in v4.0.  And apps compiled outside VS will not have this attribute.
+        NetFramework = 3, // Desktop - Client or Server or ServerCore.
+        Portable = 4, // Portable Library v1   Note: We do not expect people to build executables against portable libraries!
+        NetCore = 5, // .NET Core = Windows 8 Immersive and Portable Library v2+
+        Silverlight = 6, // Silverlight but not the Phone
+        Phone = 7, // Windows Phone 7 or higher
+    }
+}