What is a BDMV file? File used by Blu-ray discs to describe the contents of a Blu-ray disc directory; uses a well-defined filename and directory location and is seen with one of the following file names on a Blu-ray disc: index.bdmv : describes the file contents in the BDMV directory; found in the BDMV and BDMV/​BACKUP directories. MovieObject.bdmv : describes one or more movie objects; located in the BDMV and BDMV/​BACKUP directories. sound.bdmv : optional file that relates one or more sounds associated with HDMV Interactive Graphic streams applications; located in the BDMV/​AUXDATA directory.