Mime Types Identifies the format of a file so a browser knows how to load it. Most file types should be specified by default. If you are seeing the browser trying to download or do something strange with your file that you don't expect, then the issue could be with Mime types. You can add additional types to your .htaccess file. If you do not have a .htaccess file in that directory, you can create one. Here is a good example of adding some mime types, http://www.htaccess-guide.com/adding-mime-types/. If you are on a Windows server, then you can add mime types through the Plesk interface.