QWidget is running with QQuickWidget but the program is only visible in status bar of Windows, we can not see the program main window on desktop

I packaged a Qt program with qml, and it's running ok in most Windows10. However there is a problem when I install the program in one client PC, The Icon of my program in status bar is visible, but the QWidget main window is not visible on desktop.the QWidget can be visible if I rename D3Dcompiler_47.dll which is inside my install directory to a difference name D3Dcompiler_47.bak.dll.

The Qt program is only contains a QQuickWidget, all UI are designed in the qml, most client were running ok, this issue is the first time I got the program. 

It looks like when the qt couldn't find D3Dcompiler_47.dll which is inside my install directory it will run well.

Can someone help on this issue?