Undefined variable winmaildat

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PHP

In the below function, I am getting php errors complaining about undefined variable: winmailDat.

Code appears to work, but I'm trying to clean it up - I think I haven't defined it?

if ($show_attach_container) {
        $description .= '<tr><td colspan=2> <fieldset>
        <legend class="'.$attach_toggle_cls.'" onclick="og.toggle(\'mv_attachments\',this)">' . lang('attachments') . '</legend>
        <div id="mv_attachments" style="'.$attach_div_style.'">
        <table>';
        foreach($attachments as $att) {
            if (!array_var($att, 'hide')) {
                $size = $att['size'];//format_filesize(strlen($att["Data"]));
                $fName = str_starts_with($att["FileName"], "=?") ? iconv_mime_decode($att["FileName"], 0, "UTF-8") : utf8_safe($att["FileName"]);
                if (trim($fName) == "" && strlen($att["FileName"]) > 0) $fName = utf8_encode($att["FileName"]);
                $description .= '<tr><td style="padding-right: 10px">';

                $ext = get_file_extension($fName);
                $fileType = FileTypes::getByExtension($ext);
                $icon = $fileType instanceof FileType ? $fileType->getIcon() : "unknown.png";

                $att_id = $c;
                $inside_attachment = trim(array_var($att, 'inside_attachment', ""));
                if ($inside_attachment != "") {
                    $att_id = $inside_attachment;
                }
                $download_url = get_url('mail', 'download_attachment', array('email_id' => $email->getId(), 'attachment_id' => $att_id));
                include_once ROOT . "/library/browser/Browser.php";
                if (Browser::instance()->getBrowser() == Browser::BROWSER_IE) {
                    $download_url = "javascript:location.href = '$download_url';";
                }

                $description .= '<img src="' . get_image_url("filetypes/" . $icon) .'"></td>
                <td><div id="att-link-container-'.$c.'">
                    <a target="_self" href="' . $download_url . '&fileAttachName='.$fName.'&winmailtype='.$winmailDat.'" class="download-attachment-link">' . clean($fName) . " ($size)" . '</a>
                </div></td></tr>';
            }
            $c++;
        }
        $description .= '</table></div></fieldset></td></tr>';
    }

What I have tried:

I'm unsure how to define this variable properly, and would appreciate any assistance.