diff --git a/app/models/dunlop/target_file_model.rb b/app/models/dunlop/target_file_model.rb
index 855b575..da441cb 100644
--- a/app/models/dunlop/target_file_model.rb
+++ b/app/models/dunlop/target_file_model.rb
@@ -106,7 +106,8 @@ module Dunlop::TargetFileModel
   end
 
   def new_working_file
-    local_working_file = Tempfile.new("target_file", Rails.application.config.working_path)
+    #local_working_file = Tempfile.new("target_file", Rails.application.config.working_path)
+    local_working_file = Tempfile.new([target_basename, File.extname(target_basename)], Rails.application.config.working_path) # keep reference for tempfile till unzip completed and keep extension preserved
     FileUtils.chmod(0666, local_working_file.path)
     local_working_file
   end
diff --git a/app/views/application/_admin_user_roles.html.slim b/app/views/application/_admin_user_roles.html.slim
index 7d44469..80f1462 100644
--- a/app/views/application/_admin_user_roles.html.slim
+++ b/app/views/application/_admin_user_roles.html.slim
@@ -3,3 +3,4 @@
   .column= render "dunlop/users/scenario_permissions"
   .column= render "dunlop/users/source_files_permissions"
   .column= render "dunlop/users/target_files_permissions"
+