diff -u qt-everywhere-opensource-src-5.1.1-x64\qtbase\src\plugins\platforms\windows/qwindowsdrag.cpp qt-everywhere-opensource-src-5.1.1-x86\qtbase\src\plugins\platforms\windows/qwindowsdrag.cpp
--- qt-everywhere-opensource-src-5.1.1-x64\qtbase\src\plugins\platforms\windows/qwindowsdrag.cpp	2013-08-25 21:03:36.000000000 +0400
+++ qt-everywhere-opensource-src-5.1.1-x86\qtbase\src\plugins\platforms\windows/qwindowsdrag.cpp	2013-09-23 16:53:57.878021600 +0400
@@ -601,26 +601,31 @@
 QWindowsOleDropTarget::DragEnter(LPDATAOBJECT pDataObj, DWORD grfKeyState,
                                  POINTL pt, LPDWORD pdwEffect)
 {
+    QWindow *dragOverWindow = findDragOverWindow(pt);
+    m_dragOverWindow = dragOverWindow;
+
     if (IDropTargetHelper* dh = QWindowsDrag::instance()->dropHelper())
-        dh->DragEnter(reinterpret_cast<HWND>(m_window->winId()), pDataObj, reinterpret_cast<POINT*>(&pt), *pdwEffect);
+        dh->DragEnter(reinterpret_cast<HWND>(dragOverWindow->winId()), pDataObj, reinterpret_cast<POINT*>(&pt), *pdwEffect);
 
     if (QWindowsContext::verboseOLE)
-        qDebug("%s widget=%p key=%lu, pt=%ld,%ld", __FUNCTION__, m_window, grfKeyState, pt.x, pt.y);
+        qDebug("%s widget=%p key=%lu, pt=%ld,%ld", __FUNCTION__, dragOverWindow, grfKeyState, pt.x, pt.y);
 
     QWindowsDrag::instance()->setDropDataObject(pDataObj);
     pDataObj->AddRef();
-    const QPoint point = QWindowsGeometryHint::mapFromGlobal(m_window, QPoint(pt.x,pt.y));
-    handleDrag(m_window, grfKeyState, point, pdwEffect);
+    const QPoint point = QWindowsGeometryHint::mapFromGlobal(dragOverWindow, QPoint(pt.x,pt.y));
+    handleDrag(dragOverWindow, grfKeyState, point, pdwEffect);
     return NOERROR;
 }
 
 QT_ENSURE_STACK_ALIGNED_FOR_SSE STDMETHODIMP
 QWindowsOleDropTarget::DragOver(DWORD grfKeyState, POINTL pt, LPDWORD pdwEffect)
 {
+    QWindow *dragOverWindow = findDragOverWindow(pt);
+    m_dragOverWindow = dragOverWindow;
+
     if (IDropTargetHelper* dh = QWindowsDrag::instance()->dropHelper())
         dh->DragOver(reinterpret_cast<POINT*>(&pt), *pdwEffect);
 
-    QWindow *dragOverWindow = findDragOverWindow(pt);
     if (QWindowsContext::verboseOLE)
         qDebug("%s widget=%p key=%lu, pt=%ld,%ld", __FUNCTION__, dragOverWindow, grfKeyState, pt.x, pt.y);
     const QPoint tmpPoint = QWindowsGeometryHint::mapFromGlobal(dragOverWindow, QPoint(pt.x,pt.y));
@@ -640,13 +645,15 @@
 QT_ENSURE_STACK_ALIGNED_FOR_SSE STDMETHODIMP
 QWindowsOleDropTarget::DragLeave()
 {
+    QWindow *dragOverWindow = m_dragOverWindow ? m_dragOverWindow.data() : m_window;
+
     if (IDropTargetHelper* dh = QWindowsDrag::instance()->dropHelper())
         dh->DragLeave();
 
     if (QWindowsContext::verboseOLE)
-        qDebug().nospace() <<__FUNCTION__ << ' ' << m_window;
+        qDebug().nospace() <<__FUNCTION__ << ' ' << dragOverWindow;
 
-    QWindowSystemInterface::handleDrag(m_window, 0, QPoint(), Qt::IgnoreAction);
+    QWindowSystemInterface::handleDrag(dragOverWindow, 0, QPoint(), Qt::IgnoreAction);
     QWindowsDrag::instance()->releaseDropDataObject();
 
     return NOERROR;
diff -u qt-everywhere-opensource-src-5.1.1-x64\qtbase\src\plugins\platforms\windows/qwindowsdrag.h qt-everywhere-opensource-src-5.1.1-x86\qtbase\src\plugins\platforms\windows/qwindowsdrag.h
--- qt-everywhere-opensource-src-5.1.1-x64\qtbase\src\plugins\platforms\windows/qwindowsdrag.h	2013-08-25 21:03:36.000000000 +0400
+++ qt-everywhere-opensource-src-5.1.1-x86\qtbase\src\plugins\platforms\windows/qwindowsdrag.h	2013-09-23 16:52:21.781525200 +0400
@@ -79,6 +79,7 @@
 
     ULONG m_refs;
     QWindow *const m_window;
+    QPointer<QWindow> m_dragOverWindow;
     QRect m_answerRect;
     QPoint m_lastPoint;
     DWORD m_chosenEffect;