Most likely the biggest problem you’re going to have is with the vids themselves. It’s not that they are in a “linux format”, but rather because the DVR makers caved into the *IAA demands that there be some kind of encryption around the video files themselves. You will likely have to search around a bit to determine if there is a hack for the ‘wrapper’ that contains the files. It’s a major PITA.
As the OP stated, he hasn’t been able to get to the files. After transferring the files to a USB successfully, the USB can’t be read on a Windows machine. He searched the internet about Linux to Windows and it returns how to change files, thus he posed his question here. The files themselves are not the current issue. The issue is file system as the USB won’t read on windows as it is formatted to a files system that windows can’t read.