I found inside the Video folder the folder named PLATFORMS. When I look inside I was 4 video file that I don't remember if I put there anyway.. I did notice if was the one playing when I go on Turbografx, Wonderswan, Wonderswan Color and PS2. I delete the 4 files and put all the video I want with the exact name of each platform. Again, I go in Big Box and yes Turbografx, Wonderswan, Wonderswan Color and PS2 took the video I paste inside. But all the other platform still take a video from I don't know where...
Really don't understand that issue.
Thanks if someone have a idea