Magic_mimeConvert file extensions to MIME types
lookup ~default filename will return a MIME type for the full filename supplied by examining its extension and look it up by using Mime_types.map_extension or Mime_types.map_file if there is no file extension present.
Convert MIME types to file extensions
reverse_lookup mime will return a list of file extensions for the MIME type supplied by stripping any parameters and looking it up by using Mime_types.map_mime. If an unknown MIME type is supplied, empty list is returned.