Running External Program Thru Shell Exec

[singtome]

Hi all!
I have a dedicated windows server.
Everything is compiled as far as IIS, Mysql & php is concerned.
But, I have this problem: I call external program commands through php using shell_exec.
The thing is that php responds OK when it comes to 'dir' or 'cd', but, in another program,
not windows-native, there is no response.
The program is set up in the PATH, because, if I open a cmd shell, I can call it from everywhere and it works fine!
I have given full control permissions to IUSR for the external program I am trying to call as well as the cmd.exe.
Any ideas on why shell_exec is not working?

[WeAnswer_IT]

Are you sure it's not working? When you don't get output, it can mean that the command did not execute.

<?php
$output = shell_exec("mywincmd -o -whatever");
if(empty($output))
{
  trigger_error("There was a problem executing your command, or it did not produce any output");
}
?>