I'm using SciTE to write and test this script. $iResult = RunWait(@ComSpec & ' /c "' & 'runtest.exe -i "'&$sVideo&'"', "c:\Test\Sample_Test\", @SW_SHOW, $STDERR_CHILD) ProcessWaitClose($iResult) Local $sOutput = StderrRead($iResult) MsgBox(0, "Output", $sOutput) UpdateLogFile("Output is ",&$sOutput) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ;This works fine on my test system: #include <AutoItConstants.au3> &#