My .DAT file contained 230mb of info. This means it has something in there to be recovered, zero Kb means there is nothing to rescue. That software I used to recover the file is Grau GmbH video repair. You first download a trial version to see if your file is “rescuable”. It will rescue 50% of the file, upgrade by paying around of 35€ and you will be able to rescue 5 video files. This is the lowest cost I found.