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diff --git a/src/inc/shim/runtimeselector.h b/src/inc/shim/runtimeselector.h
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+++ b/src/inc/shim/runtimeselector.h
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+// 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.
+//
+// runtimeselector.h
+//
+// Class that select the best runtime
+//
+// Note: very similar to ShimSelector but is so simple that adding a common template parent class is not worth it
+//
+// Note: must be platform independent
+//
+// ======================================================================================
+
+
+#ifndef RUNTIMESELECTOR_H
+#define RUNTIMESELECTOR_H
+
+// does not currently need to add anything to VersionAndLocationInfo
+#include "versionandlocationinfo.h"
+typedef VersionAndLocationInfo RuntimeInfo;
+
+class RuntimeSelector
+{
+protected:
+    VersionInfo m_RequestedVersion; // requested version
+    RuntimeInfo m_Best;       // the best option so far
+    bool m_bHasSomething;             // has any data
+public:
+    //constructor
+    RuntimeSelector();
+
+    // whether the given info compatible with the request
+    bool IsAcceptable(const RuntimeInfo& runtimeInfo)  const;
+
+    // add runtime info
+    HRESULT Add(const RuntimeInfo& runtimeInfo);
+
+    // set the version requested
+    void SetRequestedVersion(const VersionInfo& version);
+
+    // get the best found
+    RuntimeInfo GetBest();
+
+    // has any useful data
+    bool HasUsefulRuntimeInfo();
+    
+    // is 1st better than 2nd
+    static bool IsBetter(const RuntimeInfo& ri1, const RuntimeInfo& ri2);
+};
+
+#include "runtimeselector.inl"
+
+#endif // RUNTIMESELECTOR_H
+