Try to use Mediainfo to be sure the video/audio codec. Then rename the extension from dvr to MPEG to see whether this can work or not.
Generally for some containter video formats, you can use this method to make it play well.
Good luck. 
How to open .dvr extension format files?
I have a mac and i can’t get .drv to open can anyone help?
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try opening it using nero showtime....
search this file dvr_to_ts.rar this convert to ts format and you can play this file with vlc media player on the pc.
I am also tried other video software, but not open.
anybody read this message reply
throuh Pud***
El “AVS MediaPlayer” los reproducer perfectamente.
http://www.avs4you.com/AVS-Media-Player.aspx
Wavepad works for my audio files recorded as .DVR
please help me to open dvr format
google Ariva_TS_Tool.exe
How do I get the video from a DVR 207 to play on a windows vista media player ?
But How ? :3
try:
DVR Converter 3.0.11.404
http://dvr-converter.softonic.de/
try to use “cccp” in one time ago its work with me
just download magicradar here: http://www.cctvbenelux.nl/ox-nl/handleidingen/updates-upgrades-nl
MediaPlayerLite works
dvr