My program sets "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced" value "Hidden". Hovewer I'm not able to refresh the explorer to take into account this change. I've tried:

1)

    SHChangeNotify(SHCNE_ASSOCCHANGED, SHCNF_IDLIST, IntPtr.Zero, IntPtr.Zero);` 

2)

    SHELLSTATE state = new SHELLSTATE(); 
    state.fShowAllObjects = (uint)1; 
    SHGetSetSettings(ref state, SSF.SSF_SHOWALLOBJECTS, true); 

3)

    SendMessageTimeout(HWND_BROADCAST, WM_SETTINGCHANGE, SPI_SETNONCLIENTMETRICS, 0, SMTO_ABORTIFHUNG, 5000, ref dwResult); 

4)

    SendMessage(HWND_BROADCAST, WM_COMMAND, 28931 /* Refresh */, 0); 

Nothing works. So what should I do? If I refresh Explorer myself with F5, then it works. Hovewer I would like some elegant solution, so it would refresh the display everywhere, even in OpenFile/SaveFile dialogs, which are currently open.

I'm using C# .NET, Win7.