...check if the ActiveDesktop is activ?

uses
  ComObj, ShlObj, ActiveX;

// Check if Active Desktop is enabled (1)
function IsActiveDeskTopOn: Boolean;
var
  h: HWND;
begin
  h := FindWindow('Progman', nil);
  h := FindWindowEx(h, 0, 'SHELLDLL_DefView', nil);
  h := FindWindowEx(h, 0, 'Internet Explorer_Server', nil);
  Result := h <> 0;
end;


// Check if Active Desktop is enabled (2)
function IsActiveDesktopEnable: Boolean;
const
  CLSID_ActiveDesktop: TGUID = '{75048700-EF1F-11D0-9888-006097DEACF9}';
var
  ActiveDesk: IActiveDesktop;
  ComponentsOpt: TComponentsOpt;
  hr: HRESULT;
  dwReserved: DWORD;
begin
  ZeroMemory(@ComponentsOpt, SizeOf(TComponentsOpt));
  ComponentsOpt.dwSize := SizeOf(TComponentsOpt);
  hr := CoCreateInstance(CLSID_ActiveDesktop, nil, CLSCTX_INPROC_SERVER,
    CLSID_ActiveDesktop, ActiveDesk);
  if SUCCEEDED(hr) then
  begin
    hr := ActiveDesk.GetDesktopItemOptions(ComponentsOpt, dwReserved);
    // ActiveDesk._Release;
  end;
  Result := ComponentsOpt.fActiveDesktop;
end;

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