diff --git a/reactos/include/psdk/ctxtcall.idl b/reactos/include/psdk/ctxtcall.idl
new file mode 100644
index 00000000000..f07dc1bb79e
--- /dev/null
+++ b/reactos/include/psdk/ctxtcall.idl
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2008 Louis Lenders
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+import "wtypes.idl";
+import "objidl.idl";
+import "unknwn.idl";
+
+typedef struct tagComCallData
+{
+    DWORD dwDispid;
+    DWORD dwReserved;
+    void  *pUserDefined;
+} ComCallData;
+
+/***************************************************************************
+ * IContextCallback
+ */
+[
+  local,
+  object,
+  uuid(000001da-0000-0000-c000-000000000046),
+  pointer_default(unique)
+]
+interface IContextCallback : IUnknown
+{
+    typedef HRESULT (__stdcall *PFNCONTEXTCALL)(ComCallData *pParam);
+
+    HRESULT ContextCallback(
+            [in] PFNCONTEXTCALL pCallback,
+            [in] ComCallData *pParam,
+            [in] REFIID riid,
+            [in] int iMethod,
+            [in] IUnknown *pUnk);
+}
diff --git a/reactos/include/psdk/psdk.rbuild b/reactos/include/psdk/psdk.rbuild
index d9f642a7963..d08e3c8f287 100644
--- a/reactos/include/psdk/psdk.rbuild
+++ b/reactos/include/psdk/psdk.rbuild
@@ -5,6 +5,7 @@
 	<file>activdbg.idl</file>
 	<file>activscp.idl</file>
 	<file>control.idl</file>
+	<file>ctxtcall.idl</file>
 	<file>dimm.idl</file>
 	<file>dispex.idl</file>
 	<file>docobj.idl</file>