diff --git a/dlls/mshtml/htmlwindow.c b/dlls/mshtml/htmlwindow.c
index 58d5f7b5789..1df97b9a128 100644
--- a/dlls/mshtml/htmlwindow.c
+++ b/dlls/mshtml/htmlwindow.c
@@ -27,7 +27,6 @@
 #include "mshtmdid.h"
 
 #include "wine/debug.h"
-#include "wine/unicode.h"
 
 #include "mshtml_private.h"
 #include "htmlevent.h"
@@ -35,6 +34,8 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(mshtml);
 
+#define HTMLPRIVWINDOW(x)  ((IHTMLPrivateWindow*)  &(x)->lpIHTMLPrivateWindowVtbl)
+
 static struct list window_list = LIST_INIT(window_list);
 
 static void window_set_docnode(HTMLWindow *window, HTMLDocumentNode *doc_node)
@@ -166,6 +167,9 @@ static HRESULT WINAPI HTMLWindow2_QueryInterface(IHTMLWindow2 *iface, REFIID rii
     }else if(IsEqualGUID(&IID_IHTMLWindow4, riid)) {
         TRACE("(%p)->(IID_IHTMLWindow4 %p)\n", This, ppv);
         *ppv = HTMLWINDOW4(This);
+    }else if(IsEqualGUID(&IID_IHTMLPrivateWindow, riid)) {
+        TRACE("(%p)->(IID_IHTMLPrivateWindow %p)\n", This, ppv);
+        *ppv = HTMLPRIVWINDOW(This);
     }else if(dispex_query_interface(&This->dispex, riid, ppv)) {
         return *ppv ? S_OK : E_NOINTERFACE;
     }
@@ -1641,6 +1645,87 @@ static const IHTMLWindow4Vtbl HTMLWindow4Vtbl = {
     HTMLWindow4_get_frameElement
 };
 
+#define HTMLPRIVWINDOW_THIS(iface) DEFINE_THIS(HTMLWindow, IHTMLPrivateWindow, iface)
+
+static HRESULT WINAPI HTMLPrivateWindow_QueryInterface(IHTMLPrivateWindow *iface, REFIID riid, void **ppv)
+{
+    HTMLWindow *This = HTMLPRIVWINDOW_THIS(iface);
+
+    return IHTMLWindow2_QueryInterface(HTMLWINDOW2(This), riid, ppv);
+}
+
+static ULONG WINAPI HTMLPrivateWindow_AddRef(IHTMLPrivateWindow *iface)
+{
+    HTMLWindow *This = HTMLPRIVWINDOW_THIS(iface);
+
+    return IHTMLWindow2_AddRef(HTMLWINDOW2(This));
+}
+
+static ULONG WINAPI HTMLPrivateWindow_Release(IHTMLPrivateWindow *iface)
+{
+    HTMLWindow *This = HTMLPRIVWINDOW_THIS(iface);
+
+    return IHTMLWindow2_Release(HTMLWINDOW2(This));
+}
+
+static HRESULT WINAPI HTMLPrivateWindow_SuperNavigate(IHTMLPrivateWindow *iface, BSTR url, BSTR arg2, BSTR arg3,
+        BSTR arg4, VARIANT *post_data_var, VARIANT *headers_var, ULONG flags)
+{
+    HTMLWindow *This = HTMLPRIVWINDOW_THIS(iface);
+    FIXME("(%p)->(%s %s %s %s %s %s %x)\n", This, debugstr_w(url), debugstr_w(arg2), debugstr_w(arg3),
+          debugstr_w(arg4), debugstr_variant(post_data_var), debugstr_variant(headers_var), flags);
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI HTMLPrivateWindow_GetPendingUrl(IHTMLPrivateWindow *iface, BSTR *url)
+{
+    HTMLWindow *This = HTMLPRIVWINDOW_THIS(iface);
+    FIXME("(%p)->(%p)\n", This, url);
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI HTMLPrivateWindow_SetPICSTarget(IHTMLPrivateWindow *iface, IOleCommandTarget *cmdtrg)
+{
+    HTMLWindow *This = HTMLPRIVWINDOW_THIS(iface);
+    FIXME("(%p)->(%p)\n", This, cmdtrg);
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI HTMLPrivateWindow_PICSComplete(IHTMLPrivateWindow *iface, int arg)
+{
+    HTMLWindow *This = HTMLPRIVWINDOW_THIS(iface);
+    FIXME("(%p)->(%x)\n", This, arg);
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI HTMLPrivateWindow_FindWindowByName(IHTMLPrivateWindow *iface, LPCWSTR name, IHTMLWindow2 **ret)
+{
+    HTMLWindow *This = HTMLPRIVWINDOW_THIS(iface);
+    FIXME("(%p)->(%s %p)\n", This, debugstr_w(name), ret);
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI HTMLPrivateWindow_GetAddressBar(IHTMLPrivateWindow *iface, BSTR *url)
+{
+    HTMLWindow *This = HTMLPRIVWINDOW_THIS(iface);
+    FIXME("(%p)->(%p)\n", This, url);
+    return E_NOTIMPL;
+}
+
+#undef HTMLPRIVWINDOW_THIS
+
+static const IHTMLPrivateWindowVtbl HTMLPrivateWindowVtbl = {
+    HTMLPrivateWindow_QueryInterface,
+    HTMLPrivateWindow_AddRef,
+    HTMLPrivateWindow_Release,
+    HTMLPrivateWindow_SuperNavigate,
+    HTMLPrivateWindow_GetPendingUrl,
+    HTMLPrivateWindow_SetPICSTarget,
+    HTMLPrivateWindow_PICSComplete,
+    HTMLPrivateWindow_FindWindowByName,
+    HTMLPrivateWindow_GetAddressBar
+};
+
 #define DISPEX_THIS(iface) DEFINE_THIS(HTMLWindow, IDispatchEx, iface)
 
 static HRESULT WINAPI WindowDispEx_QueryInterface(IDispatchEx *iface, REFIID riid, void **ppv)
@@ -1954,6 +2039,7 @@ HRESULT HTMLWindow_Create(HTMLDocumentObj *doc_obj, nsIDOMWindow *nswindow, HTML
     window->lpHTMLWindow2Vtbl = &HTMLWindow2Vtbl;
     window->lpHTMLWindow3Vtbl = &HTMLWindow3Vtbl;
     window->lpHTMLWindow4Vtbl = &HTMLWindow4Vtbl;
+    window->lpIHTMLPrivateWindowVtbl = &HTMLPrivateWindowVtbl;
     window->lpIDispatchExVtbl = &WindowDispExVtbl;
     window->ref = 1;
     window->doc_obj = doc_obj;
diff --git a/dlls/mshtml/mshtml_private.h b/dlls/mshtml/mshtml_private.h
index 778f29040f4..f2ef1af1e84 100644
--- a/dlls/mshtml/mshtml_private.h
+++ b/dlls/mshtml/mshtml_private.h
@@ -235,6 +235,7 @@ struct HTMLWindow {
     const IHTMLWindow2Vtbl *lpHTMLWindow2Vtbl;
     const IHTMLWindow3Vtbl *lpHTMLWindow3Vtbl;
     const IHTMLWindow4Vtbl *lpHTMLWindow4Vtbl;
+    const IHTMLPrivateWindowVtbl *lpIHTMLPrivateWindowVtbl;
     const IDispatchExVtbl  *lpIDispatchExVtbl;
 
     LONG ref;