fix error

app/controllers/announcements_controller.rb

@@ -666,7 +666,7 @@ class AnnouncementsController < ApplicationController
             return
           else
             user_agent = request.user_agent.downcase
-            @escaped_file_name = user_agent.include?(/(msie|trident)/) ? CGI::escape(@filename) : @filename
+            @escaped_file_name = user_agent.match(/(msie|trident)/) ? CGI::escape(@filename) : @filename
             send_file(@path, :type=>"application/octet-stream", :filename => @escaped_file_name, :x_sendfile=> true)
             return
           end