Your TV is probably can't decode those videos properly. I have no idea why the files would have changed but I highly doubt your TV did that. The mysterious folder is probably an index.
Still, this is absolutely the wrong way to go about this. Expose your files over a DLNA media server (I use mini DLNA on a raspberry pi) and just use the TV to watch content over the network
LG still makes the best damn OLED screens around, and even if you'd be happy with a LCD screen, all the other manufacturers will also try to sell your data.
I'm using Linux kodi now. Yes via windows it had write access.
Maybe it wasn't the TV but something altered my files and IMHO a hacker / virus would of deleted them or held them ransom.
And given audio tracks playing directors talking about how hard their movie was to make then I'm convinced that holywood studios were behind it and lg helped them do it.
There was a pattern to which movies were touched and which weren't but I'm not confident enough yet to share
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