Description:
------------
When using curl upload file, mine type.

eg: .mid .mid 

.mid or .midi should be "audio/midi" not "application/octet-stream"

please check below...

Reproduce code:
---------------
function my_curl($url, $dataflds)
{
 $ch = curl_init();
 curl_setopt ($ch, CURLOPT_URL, $url);
 curl_setopt ($ch, CURLOPT_HEADER, true);
 curl_setopt ($ch, CURLOPT_POST, true);
 curl_setopt ($ch, CURLOPT_POSTFIELDS, $dataflds);
 $result = curl_exec($ch);
 curl_close($ch);
 return $result;
}

$postdata['image_file'] = "@whiteflower.jpg";
$postdata['sound_file'] = "@MusicBox.mid";

echo my_curl("http://abc.com/info.php", $postdata);

exit;

Expected result:
----------------
_FILES["image_file"]	

Array
(
    [name] => whiteflower.jpg
    [type] => image/jpeg
    [tmp_name] => /var/tmp/phpwxA1au
    [error] => 0
    [size] => 14546
)

_FILES["sound_file"]	

Array
(
    [name] => MusicBox.mid
    [type] => application/octet-stream
    [tmp_name] => /var/tmp/phpp2qVwa
    [error] => 0
    [size] => 6569
)

Actual result:
--------------
_FILES["image_file"]	

Array
(
    [name] => whiteflower.jpg
    [type] => image/jpeg
    [tmp_name] => /var/tmp/phpwxA1au
    [error] => 0
    [size] => 14546
)

_FILES["sound_file"]	

Array
(
    [name] => MusicBox.mid
    [type] => audio/midi
    [tmp_name] => /var/tmp/phpp2qVwa
    [error] => 0
    [size] => 6569
)