Index: /trunk/src/VBox/Frontends/VirtualBox/src/extensions/QIFileDialog.cpp
===================================================================
--- /trunk/src/VBox/Frontends/VirtualBox/src/extensions/QIFileDialog.cpp	(revision 31141)
+++ /trunk/src/VBox/Frontends/VirtualBox/src/extensions/QIFileDialog.cpp	(revision 31142)
@@ -634,5 +634,6 @@
                                             bool           aSingleFile /* = false */)
 {
-#if defined Q_WS_WIN
+/* It seems, running QFileDialog in separate thread is NOT needed under windows any more: */
+#if defined (Q_WS_WIN) && (QT_VERSION < 0x040403)
 
     /**