There is only one file type that uses the .VS4 extension:
AVTECH CCTV Video Surveillance File
Video surveillance file recorded by an AVTECH digital video recorder (DVR) or closed circuit television (CCTV) system; saves the recording in a proprietary format that can only be played by AVTECH software; used for archiving and reviewing security system videos.
VS4 files can be played back using a program called Video Player, which is included with the Video Server E software. The software is also referred to as "AVTECH DVR Software / .VSE File Player."
|AVTECH Video Server E|
Updated: July 8, 2011