Hi guys, i hava a doubt about extension associations with autoit. I have made this simple script: #include <ButtonConstants.au3> #include <EditConstants.au3> #include <GUIConstantsEx.au3> #include <WindowsConstants.au3> $Form = GUICreate("Test", 238, 77, -1, -1) $Input = GUICtrlCreateInput("", 8, 8, 169, 21) $Button_Check = GUICtrlCreateButton("Check", 8, 40, 105, 25) $Button_Cancel = GUICtrlCreateButton("Cancel", 121, 40, 105, 25) $Button_SelectFile = GUICtrlCreate