How to change a system file on thumb drive back into a .mp4

[shannonhogue]

I was moving movies (.mp4) that I had saved on multiple external hard drives to a single thumb drive.While doing so I feel asleep. I tried to open a movie on thumb drive. It shows the titles and the size of the movies in the folders. When I click on some of themovies it says it's a system file.the other movies show an empty folder. I don't know what I could have done when I fell asleep, but I just don't really want to download over 600 gb of movies again. If you help me get them back and help me understand what I could have possibly done to not be able watch these movies. I hope I explained

Continue reading...