在php中打开notepad.exe

Question

I am using XAMPP server and for me required to open notepad.exe via.php and I have tried below codes and none of them are working for me

<?php
system('c:/windows/notepad.exe');
?>

<?php
$command = "c:\windows
otepad.exe";
exec($command);
?>

<?php
exec('c:\windows
otepad.exe');
?>

waiting for your assistance