Readfile() + mpg = http status 500, windows server 2012, php 5.5.1

Hi List,
i installed a blank Windows Server 2012 Standard, added Role IIS & Feature CGI
extracted 5.5.1 VC11 x86 Non Thread Safe to c:\Program Files (x86)\php
installed vcredist_x86.exe

added Handler Mappings in IIS
Request path: *.php
Module: FastCgiModule
Executable: c:\Program Files (x86)\php\php-cgi.exe
Name: PHP via FastCgi

Added 2 files to C:\inetpub\wwwroot index.php & movie.mpg (6MB)
Content of index.php

<?php
$track = "movie.mpg";
if (file_exists($track)) {
    header("Content-Type: audio/mpeg");
    header('Content-Length: ' . filesize($track));
    header('Content-Disposition: inline; filename="movie.mpg"');
    header('X-Pad: avoid browser bug');
    header('Cache-Control: no-cache');
    readfile($track);
    exit;
} else {
    header($_SERVER['SERVER_PROTOCOL'].' 404 Not Found', true, 404);
    echo "no file";
}

?>

Now every time the index.php is requested i get an error 500 in Webserver log. But file will be delivered sucessfully.
Is there a problem with mpg files and readfile();
No difference with 5.4.17, 5.3.27 & Windows Server 2008 R2.
I know its very basic, but expected result should be: HTTP-Status: 200 or?
phpinfo() will be delivered succesful.

Thx + regards
oli

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