Leo2013

Hi, I wonder if anyone could help? I have a number of .stream files which I have extracted from an old CCTV DVR hard drive, which I need to convert to AVI or another common format to view or for safe keeping. I have searched for hours on Google, downloading many suggested pieces of software and scripts etc, however, I have not found anything which will even play the .stream file. I have also tried to put the HDD into a number of other DVR records I have, but each time it asks me to 'format the drive'. Does anyone know of any player which can play the .stream file, or can convert it into a common video file format? Thanks in advance for any help or assistance, Leo