Gmail will soon block JavaScript files from being uploaded and sent over email. Starting February 13th, you’ll no longer be able to attach .js files as they are increasingly being used as a form ...

Starting February 13, Google will no longer allow JavaScript attachments on its Gmail service, killing one of the main methods of malware distribution over the past two years.

After you attach a file, it will upload to Google and you can then append a query to the search bar about that file. Google looks like it will then try to return matching results.