"MIME file validator" validates file type on server side. This is simple module. In drupal 7, files validate only on file name extension.
This module is dependent on "fileinfo" php library.
There is no setting related to this module. Automatically working after installation
Adds an accept attribute to all file upload fields that have allowed extensions set. When provided with this information, browsers will only allow files of that type to be uploaded via dialogs, instead of offering all files.