Call BAT file from PHP on IIS 6.0 server

I am trying to call a bat file from php.  I am testing this so the contents of the bat file is:
Msg * "If this opened, the call worked"

All it is intended to do is open a message box with some text.

This attached code just shows DONE! on the screen when I clock the Do It button.  The message box does not open.

The full path to the bat file is:
C:\Inetpub\wwwroot\PHP_Call.bat

The full path to the php file is:
C:\Inetpub\wwwroot\CallFile.php

Any ideas?

<?php
if(isset($_POST['submit']))
{
exec("PHP_Call.bat");
echo "Done!";
} else {
// display the form
?>
<form action="" method="post">
<input type="submit" name="submit" value="DO IT!">
</form>
<?php
}
?>

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