User blog comment:DaNASCAT/Technical Update: December 11, 2012/@comment-452-20121211163308/@comment-13301-20121212103735

CzechOut: Believe me or not, someone said staff wanted to change the File: namespace to Photo:. I'm glad they discarded that frightening idea.

As of Media:, it's a namespace alias, and also has a special meaning when used as a internal link. And Media: is not accurate when it comes to zip files, spreadsheets, etc.