Today, in the end as well, worked out using the Acrobat Reader ActiveX COM Object "AcroPDF.PDF.1" #include-once #include <Constants.au3> #include <GUIConstantsEx.au3> #include <WindowsConstants.au3> #include <Misc.au3> #include <MenuConstants.au3> #include <WinAPI.au3> ;~ Thanks to BrewManNH ;~ http://www.autoitscript.com/forum/topic/134878-guiregistermsg-replacement-for-guictrlsetonevent-and-guigetmsg/