Support wxFileDialogCustomize when not using IFileDialog in wxMSW

This should be rarely needed, but it doesn't cost anything to support
the new customization API if IFileDialog is not available at either
compile- or run-time, as this just reuses the existing generic
implementation.

src/msw/filedlg.cpp

@@ -1022,7 +1022,9 @@ int wxFileDialog::ShowCommFileDialog(WXHWND hWndParent)
         in the upper left of the frame, it does not center
         automatically.
     */
-    if ((m_data && m_data->m_bMovedWindow) || HasExtraControlCreator()) // we need these flags.
+    if ((m_data && m_data->m_bMovedWindow) ||
+            HasExtraControlCreator() ||
+                m_customizeHook)
     {
         ChangeExceptionPolicy();
         msw_flags |= OFN_EXPLORER|OFN_ENABLEHOOK;
@@ -1060,7 +1062,7 @@ int wxFileDialog::ShowCommFileDialog(WXHWND hWndParent)
     of.nMaxFileTitle     = wxMAXFILE + 1 + wxMAXEXT;
 
     GlobalPtr hgbl;
-    if ( HasExtraControlCreator() )
+    if ( HasExtraControlCreator() || m_customizeHook )
     {
         msw_flags |= OFN_ENABLETEMPLATEHANDLE;