diff --git a/app/models/attachment.rb b/app/models/attachment.rb
index 3ce64d695..73ae44b4d 100644
--- a/app/models/attachment.rb
+++ b/app/models/attachment.rb
@@ -181,7 +181,7 @@ class Attachment < ActiveRecord::Base
   end
 
   def pack?
-    !!(self.filename =~ /\.(zip|rar|tar|gz|exe)$/i)
+    !!(self.filename =~ /\.(zip|rar|tar|gz|exe|jar|7z|iso)$/i)
   end
 
   def thumbnailable?