diff --git a/include/shobjidl.idl b/include/shobjidl.idl
index fa6d86d2ced..6624df4da18 100644
--- a/include/shobjidl.idl
+++ b/include/shobjidl.idl
@@ -2244,3 +2244,50 @@ interface INameSpaceTreeControlCustomDraw : IUnknown
         [in] RECT *prc,
         [in] NSTCCUSTOMDRAW *pnstccdItem);
 }
+
+/*****************************************************************************
+ * INameSpaceTreeControlDropHandler interface
+ */
+[
+ object,
+ uuid(F9C665D6-C2F2-4C19-BF33-8322D7352F51),
+ local
+]
+interface INameSpaceTreeControlDropHandler : IUnknown
+{
+    HRESULT OnDragEnter(
+        [in, unique] IShellItem *psiOver,
+        [in] IShellItemArray *psiaData,
+        [in] BOOL fOutsideSource,
+        [in] DWORD grfKeyState,
+        [in, out] DWORD *pdwEffect);
+
+    HRESULT OnDragOver(
+        [in, unique] IShellItem *psiOver,
+        [in] IShellItemArray *psiaData,
+        [in] DWORD grfKeyState,
+        [in, out] DWORD *pdwEffect);
+
+    HRESULT OnDragPosition(
+        [in, unique] IShellItem *psiOver,
+        [in] IShellItemArray *psiaData,
+        [in] int iNewPosition,
+        [in] int iOldPosition);
+
+    HRESULT OnDrop(
+        [in, unique] IShellItem *psiOver,
+        [in] IShellItemArray *psiaData,
+        [in] int iPosition,
+        [in] DWORD grfKeyState,
+        [in, out] DWORD *pdwEffect);
+
+    HRESULT OnDropPosition(
+        [in, unique] IShellItem *psiOver,
+        [in] IShellItemArray *psiaData,
+        [in] int iNewPosition,
+        [in] int iOldPosition);
+
+    HRESULT OnDragLeave(
+        [in, unique] IShellItem *psiOver);
+}
+cpp_quote("#define NSTCDHPOS_ONTOP -1")