Add the filename*= header for IE, based on mwehr suggestion. To be tested extensively.

Author: cdujeu

core/src/core/classes/class.HTMLWriter.php

@@ -174,7 +174,7 @@ public static function generateAttachmentsHeader(&$attachmentName, $dataSize, $i
         if ($isFile && ($dataSize != 0)) {
             header("Content-Range: bytes 0-" . ($dataSize- 1) . "/" . $dataSize . ";");
         }
-        header("Content-Disposition: attachment; filename=\"".$attachmentName."\"");
+        header('Content-Disposition: attachment; filename="' . $attachmentName . '"; filename*=utf-8\' \'' . rawurlencode($attachmentName));
         header("Expires: 0");
         header("Cache-Control: no-cache, must-revalidate");
         header("Pragma: no-cache");

core/src/plugins/access.fs/class.fsAccessDriver.php

@@ -1472,7 +1472,8 @@ public function readFile($filePathOrData, $headerType="plain", $localName="", $d
                     $header_sendfile = "X-Sendfile";
                 header($header_sendfile.": ".SystemTextEncoding::toUTF8($filePathOrData));
                 header("Content-type: application/octet-stream");
-                header('Content-Disposition: attachment; filename="' . basename($filePathOrData) . '"');
+                $filename = basename($filePathOrData);
+                header('Content-Disposition: attachment; filename="' . $filename . '"; filename*=utf-8\' \'' . rawurlencode($filename));
                 return;
             }
     if ($this->getFilteredOption("USE_XACCELREDIRECT", $this->repository->getId()) && AJXP_MetaStreamWrapper::actualRepositoryWrapperClass($this->repository->getId()) == "fsAccessWrapper" && array_key_exists("X-Accel-Mapping",$_SERVER)) {
@@ -1485,7 +1486,8 @@ public function readFile($filePathOrData, $headerType="plain", $localName="", $d
         if ($replacecount == 1) {
             header("X-Accel-Redirect: $accelfile");
             header("Content-type: application/octet-stream");
-            header('Content-Disposition: attachment; filename="' . basename($accelfile) . '"');
+            $filename = basename($accelfile);
+            header('Content-Disposition: attachment; filename="' . $filename . '"; filename*=utf-8\' \'' . rawurlencode($filename));
             return;
         } else {
             $this->logError("X-Accel-Redirect","Problem with X-Accel-Mapping for file $filePathOrData");