The MYS file format is used by DVR systems used in CCTV televisions. Often, MYS files are associated with the Vineyard CCTV system. The content of the MYS file is video material captured from surveillance cameras. It is a record in the form of a video stream. This format is proprietary and you must use PC Viewer to play back such a file.

MYS files are now rarely used and the format is considered obsolete.