Redmine

OS: windows
Lang: Chinese
When I uploaded a file with Chinese name, the file saved in Redmine/files directory has a unreadable name, and with some special word, it will failed.
I have a patch to avoid the failing,but the file name in Redmine/files will unreadable.

Index: D:/RedMine/app/models/attachment.rb
===================================================================
--- D:/RedMine/app/models/attachment.rb    (revision 1339)
+++ D:/RedMine/app/models/attachment.rb    (working copy)
@@ -40,7 +40,7 @@
       @temp_file = incoming_file
       if @temp_file.size > 0
         self.filename = sanitize_filename(@temp_file.original_filename)
-        self.disk_filename = DateTime.now.strftime("%y%m%d%H%M%S") + "_" + self.filename
+        self.disk_filename = DateTime.now.strftime("%y%m%d%H%M%S") + "_" + Digest::MD5.hexdigest(self.filename)
         self.content_type = @temp_file.content_type.to_s.chomp
         self.filesize = @temp_file.size
       end