Here the code:
#include <file.au3>
#include <Process.au3>
$Timeout=IniRead(@ScriptDir & "Config.ini", "TimeOut", "Timeout","NotFound") ;
$ReportingPath=IniRead(@ScriptDir & "Config.ini", "ReportingPath", "ATSSystemTester","NotFound")
$ScriptPath=IniRead(@ScriptDir & "Config.ini", "ScriptPath", "Script","NotFound")
$LogFileName = "test.txt"
$LogFilePath= $ScriptPath & $LogFileName
ClipPut($LogFilePath)
run($ReportingPath)
WinWaitActive("ATS SystemTester","...",$Timeout)
ControlClick("ATS SystemTester","...", "...")
Send("^v")
Sleep(3000)
Send("{Enter}")
Sleep(2000)
till the step Send("{Enter}") works. After Send("{Enter}") the second OpenFile Dialog does'nt appear.