Recover DAT file with Invalid Header

[shane123]

I was sent a file from a friend to see if I could get it recovered. He sent me 2 files:
Original.DAT - 600MB
Original.DMV - 129KB

Using MediaInfo on the DAT file, all I can see is that it is in QuickTime format and FileExtension_Invalid: mov qt

I've tried using VCDGear v3.55 to convert dat -> mpeg but I get this message:

[ VCDGEAR PROCESSING LOG ]

## VCDGear active : 4/10/2017 @ 1:25:21 PM ##
Setting multi-file output convention to '_%02d'

Original.DAT
WARNING: Specified DAT file has an invalid XA header signature.

[Original.DAT]
Could not locate MPEG stream.

I also tried using isobuster with no luck. Haven't used it before but the conversion I tried gave me a file with no data (size = 0).
VirtualDub says Cannot Parse Original.DAT

Does anyone have other programs or ideas?

[shane123]

Just tried Video Repair Software by Grau GmbH with a working sample and was only able to get a video with a gray screen.

I did try uploading the video to an online converter at www.mp4repair.org and I was actually able to see some thumbnail images of the video. Great! But..... they want to charge $59 to convert the video. Not happening. It does give me some hope that somebody out there has a solution for me since an online repair tool could produce better results than I can myself in less than a minute.

[davexnet]

Have you tried renaming the file suffix to MPG and see whether Virtualdub or VLC can open it ?

[shane123]

Have you tried renaming the file suffix to MPG and see whether Virtualdub or VLC can open it ?

I had tried earlier in VLC with no luck but just tried in VirtualDub and get the "Cannot Parse" error message as I did when I left it as a DAT suffix.