I cannot see any problems with your code. I however would like to see you check to see if the file exists before trying to execute it. So something like...

Code:

---

  
function exectest()
{
  var file_handle = file_open_read("KleinesEinmaleins.exe");
 	
    if (file_handle != 0) // if the file exists
    {
      exec("KleinesEinmaleins.exe", ""); // A simple C console application
    }
    else
    {
      beep();
    }
}
 

---

The application will beep if the file isn't found.