Disposition header: Specialcharacters in the filename

I am trying to download a file with php that has special characters in the file name. Unfortunately these characters are substituted by "_".

The code:

$filename = trim('<>$%&/=?' . '.txt');

header($_SERVER["SERVER_PROTOCOL"] . " 200 OK");
header("Cache-Control: public");
header("Content-Type: application/text");
header("Content-Transfer-Encoding: Binary");
header('Content-Disposition: attachment; '
        . sprintf('filename="%s"; ', urlencode($filename))
        . sprintf("filename*=utf-8''%s", urlencode($filename)));
echo "file contents";
die();

returns a file named

"__$%&_=_.txt"

I have tried different variations with urlencode(), rawurlencode(), mb_convert_string($filename, "UTF-8"). The already present issues Special Characters in Content-Disposition filename, How to encode the filename parameter of Content-Disposition header in HTTP? and PHP: RFC-2231 How to encode UTF-8 String as Content-Disposition filename did not really help me. Do you have any further ideas?

Encoding of the file is UTF-8.

Sprintf() seems not to be the problem:

header("Content-Disposition: attachment; filename*=utf-8''" . rawurlencode($filename)); 

or

header("Content-Disposition: attachment; filename="" . $filename . """); 

give the same result.

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