PHP access a Mapped network drive running on Xampp

I have a Xampp installation running on windows server 2003. This has a mapped network drive to a text file. I cannot read or even see the file with php (see code) I also tried fopen. I have full access to the file under windows.

I have set the Apache service to run as a domain administrator as a test however this still didn't work. I did this via the MMC service control panel logon as. option.

<?php
//file path of MEFILTER-BANNED.txt
 $filepath = "T:\\Config\\Filters\\Patterns\\MEFILTER-BANNED.txt";
 
 //file path of the log file
 $logpath = "log.txt";
 
 //file path of MEFILTER-BANNEDTEMP.txt
 $filepathtemp = "T:\\Config\\Filters\\Patterns\\MEFILTER-BANNEDTEMP.txt";
 
 if (file_exists($filepath)) {
    echo 'The file is readable';
} else {
    echo 'The file is not readable';
}
 
 
  $fh = fopen($filepath, 'a+') or exit("");
  $stringData = $_POST["domain"];
  fwrite($fh, "$stringData\r\n") or exit("");
  fclose($fh);
?>

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