There are 2 file types use the .MBR file extension:
1. Master Boot Record File
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.
Updated: November 7, 2010
2. Zune Smooth Streaming File
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.
|Microsoft Zune — Discontinued||Free+|
Updated: September 6, 2011