Created Unassigned: SlideShowWindow.HWND Member not found [20929]

Just thought I'd try your NetOffice dll in place of PIA in my app but get the following exception when trying to access:

```
Presentation.SlideShowWindow.HWND
```

> System.Runtime.InteropServices.COMException
HResult=-2147352573
Message=Member not found. (Exception from HRESULT: 0x80020003 (DISP_E_MEMBERNOTFOUND))
ErrorCode=-2147352573