Fix for html files not working with file type setting of wp file access manager.

helper-functions.php

/**
* It has to be overwriten in the plugin file manually unfortunately.
* For some reason, the standard wp function for checking mimetype does not return proper value for the html or htm files.
* Thats why the following function needs to be edited to fix the issue.
* The file is inside includes folder named helper-functions.php
* Simply find the function named get_file_mime_type and replace the whole function with the following.
*/

function get_file_mime_type( $file_path ){
	$mime = mime_content_type($file_path); 

	return $mime;
}