Asian Characters

Hi,

I uploaded a file with filename including Japanese language. When I download the file, the file name is not displayed correctly in Internet Explorer 11. By the way, Chrome works fine.

In order to solve specific problem, I have modified the code as follows.
Could you please apply this fix for Japanese (and other Asian characters) ?

(line 87 in libs/class.FileSystem.php)
Original:
header(“Content-disposition: attachment;filename=\”{$filename}\””);
Modified:
header(“Content-disposition: attachment;filename*=UTF-8””.rawurlencode($filename));

For your information, related RFC is below.
https://tools.ietf.org/html/rfc6266