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Hi guys. I want to open a .pptx presentation as a .pps (without change the extension) Local $obj = ObjCreate("PowerPoint.Application") Local $PresInterface = $obj.Presentations Local $objPres = $PresInterface.Open(@ScriptDir & "\Presentacion.pptx") $objPres.SlideShowSettings.Run() $obj.visible = 0 ; Waiting for user to close the window Sleep(8000) $obj.Quit() Exit I want to hide the powerpoint application before it has opened the presentation in fullscreen. But the .visible=false dosn't work whereas MSDN says it's possible. We intercepted a COM Error ! err.description is: Application.Visible : Invalid request. Hiding the application window is not allowed. err.windescription: err.number is: 80020009 Have you got an idea why it's not allowed? Another possibility which do the same thing : On msdn forum, i found this (VB): http://social.msdn.microsoft.com/Forums/en-US/csharpgeneral/thread/e0c6bde2-ed02-42e1-87ed-36d56297fdea/ appPPT.Presentations.Open filename, WithWindow:=False But can't manage to code this with AutoIt: Local $objPres = $PresInterface.Open(@ScriptDir & "\Presentacion.pps","WithWindow:=false") Someone has an idea? Thx a lot in advance, Tim