MIME

 Multipurpose Internet Mail Extensions

MIME is the acronym of Multipurpose Internet Mail Extensions. MIME type is an optional field on your integrations. 

Instead of you defining your extension along with your File name, you may choose among the listed extension types for the output file. This option doesn't change the actual file format. To change the file format you need to select an alternate output format in Get Data or modify your transformation in Transformation Data tabs.