I haven't tryed it on a DVD player, but I can play media files from it on my phone no problem. My guess is that the files he was ysing weren't compatible with that player, but as I said, I'm not absalutely certain on that.
My 64GB stick was faulty and could not be read on any of the 4 systems I have access to (XP, Win 7 & 8 or Linux) the supplier refunded my money without quibble. If you cannot open it on any other machines then it is most likely to be faulty. If you can use it on a PC then it is most likely an incompatibility issue.
I don't know what you mean! If a film is already on my hard drive on my pc, I simply drag it to my 64 GB USB on my pc and wait for it to load, after a few mts I insert my usb into my usb connecter on the tv and play away where you can play it at your leisure