Windows Server 2003+IIS6 How to execute BAT file under PHP

How does PHP execute a BAT file under Window server 2003+IIS6?
Another EXE program was called in my bat file, the code is as follows
@echo off
CD "Path to my exe program"
Dir
Xxx.exe argument1 Argument2
Exit
Then I call the bat file in PHP and the code is as follows
$res = System (' cmd/c c:\\ivl\\view\\webrooms\\test.bat ', $retval);
echo "
". $res." Return: "$retval;
The result is output from the dir command, but there is no Xxx.exe program to execute the call.

I checked the information on the Internet and gave iuser_xxx the ability to read and execute Xxx.exe and the directory where the batch files were located, but still could not execute.
May I ask you, how should the code be realized?

Thank you!

------Solution--------------------
Now that you know it's a permissions issue.
So, give the right permission on the line ....
------Solution--------------------
Why do I have to "cmd/c" to execute the bat file? Is it the same with direct execution?

