diff --git a/app/controllers/announcements_controller.rb b/app/controllers/announcements_controller.rb
index 64bc8d8..fce2b0e 100644
--- a/app/controllers/announcements_controller.rb
+++ b/app/controllers/announcements_controller.rb
@@ -665,7 +665,9 @@ class AnnouncementsController < ApplicationController
             render "archives/redirect_to_file.html",:layout=>false
             return
           else
-            send_file(@path)
+            user_agent = request.user_agent.downcase
+            @escaped_file_name = user_agent.include?(/(msie|trident)/) ? CGI::escape(@filename) : @filename
+            send_file(@path, :type=>"application/octet-stream", :filename => @escaped_file_name, :x_sendfile=> true)
             return
           end
         end