I had a DVR last year from a premises which exported files in .dv4 file format. Problem was the entire contents of the hard disk were required but we could not keep the recorder.
I cloned the hard drive forensically to ensure I had an exact copy of the original disk then attached the clone to a linux computer system.
i then copied all the .stream files from the clone drive to a FAT32 hard disk, obviously keeping the folder structure intact.
I then renamed the .stream files to .dv4 and the proprietary player downloaded from the recorder was able to play the files.
I have had another recorder since then which although visually looked different still downloaded files in .dv4 format and showed raw files as .stream files unfortunately all versions of the .dv4 player that i have failed to give pictures .
The above is definately worth a try!
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