diff --git a/app/controllers/attachments_controller.rb b/app/controllers/attachments_controller.rb
index 9c3b624af..d3781d747 100644
--- a/app/controllers/attachments_controller.rb
+++ b/app/controllers/attachments_controller.rb
@@ -73,7 +73,7 @@ class AttachmentsController < ApplicationController
     if candown || User.current.admin? || User.current.id == @attachment.author_id
       @attachment.increment_download
       if stale?(:etag => @attachment.digest)
-        convered_file = @attachment.disk_filename
+        convered_file = @attachment.diskfile
         unless pdf?(convered_file)
           convered_file = File.join(Rails.root, "files", "convered_office", @attachment.disk_filename + ".pdf")
         end
diff --git a/lib/tasks/office.rake b/lib/tasks/office.rake
index ce2d3a221..c6ee8b4dd 100644
--- a/lib/tasks/office.rake
+++ b/lib/tasks/office.rake
@@ -1,3 +1,5 @@
+#coding=utf-8
+
 namespace :office do
   desc "conver any files to html"
   task :conver => :environment do
diff --git a/lib/trustie/utils/office.rb b/lib/trustie/utils/office.rb
index adfa3fb5c..61d6b9d4c 100644
--- a/lib/trustie/utils/office.rb
+++ b/lib/trustie/utils/office.rb
@@ -1,3 +1,5 @@
+#coding=utf-8
+
 module Trustie
   module Utils
     class Office