The test flash drive we used was reformatted by the dvr before copying. After copying our Windows machines didn’t even know a flash drive had been plugged in. They didn’t even see it.
Ok so first you need to download a utility to read linux partitions from Windows. However, then you are going to run into the trickier part, that the Dish DVR stores the videos in an encoded format designed so they can only be viewed on the DVR.
Once you can copy the files to Windows you will need to try one of those conversion websites in the previous link I posted and maybe they can successfully decode the Dish format. Otherwise the only option would be to get a utility that can rip the stream from the DVR, then play the files on the DVR for every one you want to keep while the utility rips them and stores them on your computer.