Multimedia file used by Zune, an audio and video player for Windows; contains a link to an audio or video file purchased through the Zune service, but does not include the actual audio or video data itself; enables multimedia files to be streamed without having to store them locally.
System file used by Linux operating systems; contains the master boot record, which is used to startup, or bootstrap, the operating system; used for saving or distributing the MBR data.