diff --git a/vendor/built_in_modules/announcement/app/helpers/panel/announcement/back_end/bulletins_helper.rb b/vendor/built_in_modules/announcement/app/helpers/panel/announcement/back_end/bulletins_helper.rb
index 8d5d9ecb..7cb16a3b 100644
--- a/vendor/built_in_modules/announcement/app/helpers/panel/announcement/back_end/bulletins_helper.rb
+++ b/vendor/built_in_modules/announcement/app/helpers/panel/announcement/back_end/bulletins_helper.rb
@@ -37,15 +37,19 @@ module Panel::Announcement::BackEnd::BulletinsHelper
   end
 
   def file_picture_preview_setting(file_path)
-    res= ""
-    #ext = File.extname(file_path)
-    ext = MIME::Types.type_for(file_path).first.to_s.split("/")[1]
+    ext = File.extname(file_path)[1..-1].downcase
     unless file_path.nil?
       case ext
         when "jpg","jpeg","png","gif"
           {"data-content" => "#{image_tag file_path}" }
-        when "pdf", "doc", "docx", "xls", "xlsx", "ppt", "pptx"
-          {"data-content" => "#{image_tag("http://#{request.host_with_port}/assets/ft-icons/#{ext}/#{ext}-48_32.png")}"}
+        when "pdf", "zip", "rar"
+          {"data-content" => "#{image_tag("http://#{request.host_with_port}/assets/ft-icons/#{ext}/#{ext}-64_32.png")}"}
+        when "doc", "docx"
+          {"data-content" => "#{image_tag("http://#{request.host_with_port}/assets/ft-icons/docx_mac/docx_mac-64_32.png")}"}
+        when "xls", "xlsx"
+          {"data-content" => "#{image_tag("http://#{request.host_with_port}/assets/ft-icons/xlsx_mac/xlsx_mac-64_32.png")}"}
+        when "ppt", "pptx"
+          {"data-content" => "#{image_tag("http://#{request.host_with_port}/assets/ft-icons/pptx_mac/pptx_mac-64_32.png")}"}
         else
           {"data-content" => t("sys.not_previewable") }
       end