Description:
------------
The script copy the URL into an existing file (robot.txt)
The error occurs when you run the test script from the command line 
by providing the absolut path of your php.exe like

>c:\php\php.exe test.php

When you don't provide the absolut php path, the problem does not occure

>php test.php








Test script:
---------------
<?php

$outfile="c:\\robots.txt";
$infile="http://www.astrobox.at/robots.txt";
$ch = curl_init($infile);
$fo = fopen($outfile, "rb+" );
curl_setopt($ch, CURLOPT_FILE, $fo);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_exec($ch);
curl_close($ch);
fclose($fo);

?>

Expected result:
----------------
nothing

Actual result:
--------------
C:\phpda>c:\php\php.exe C:\phpda\test.php
PHP Warning:  curl_setopt(): the provided file handle is not writable in C:\phpda\test.php on line 7

Warning: curl_setopt(): the provided file handle is not writable in C:\phpda\test.php on line 7
User-agent: *
Disallow: /administrator/
Disallow: /cache/
Disallow: /components/
Disallow: /editor/
Disallow: /help/
Disallow: /images/
Disallow: /includes/
Disallow: /language/
Disallow: /mambots/
Disallow: /media/
Disallow: /modules/
Disallow: /templates/
Disallow: /installation/
Disallow: /astrobox/produkte/
Disallow: /option/