$tData = DllStructCreate('byte[20]')
$tPos = DllStructCreate('dword[4]', DllStructGetPtr($tData))
DllStructSetData($tPos, 1, 0, 1) ; X
DllStructSetData($tPos, 1, 0, 2) ; Y
DllStructSetData($tPos, 1, @DesktopWidth, 3) ; Width
DllStructSetData($tPos, 1, @DesktopHeight / 2, 4) ; Height
RegWrite('HKCU\Software\Microsoft\Windows Photo Viewer\Viewer', 'MainWndPos', 'REG_BINARY', DllStructGetData($tData, 1))