The plugin additionally allows the mime types and file extensions to WordPress.
The operation is the simple. Please install this plugin and activate it.
First of all, please check the "Media Type Settings" in the "Settings". You can see the list of allowed mime types and file extensions by WordPress.
When you add the mime type or file extension, the data will be added to last item in this list at the red color.
About the mime type list, please see the list of mime types in the information of the Internet. Ex. http://www.freeformatter.com/mime-types-list.html
The user who have the manage_options permission can only add the setting.