Run .exe file from ci3 in IIS server

Code:

I want to run an .exe program from Codeigniter 3 on an IIS server, but it doesn't do anything. Does anyone know how to configure the IIS server so that I can start an .exe program?
<?php
$answer = shell_exec("c:\inetpub\vhosts\programozas.org\ci3\OlszCommandLine.exe");
echo $answer."</br>";
?>