If I recall on JB, I had to install Astro File viewer to see the actual folder because stock file viewer and Polaris wouldn't show it. Is it viewable in kitkat through stock file viewers?
from "Ms Note 3"
The "My Files" app has the option to show hidden files. You can navigate to the folder and view them but in that app it does not give you the option to choose how to open the file and the file will not open with the default app.
I used X-Plore and can choose to open the file with MX Player and it plays fine. But most people will be better off just using the Play Movie app to play it. Just like with Play Music, the files saved to the device are not saved with the name of the movie/show/song but with a random filename. Also, with the movie files they are stored in multiple folders. For example, subtitles are in separate folders. The average user will be too confused or frustrated to bother figuring out what to play and how to play it.
However, that is where to find them and they can indeed be manually played from that folder if you use a 3rd party file explorer and 3rd party video player. Or you could copy it all over to your computer and sort it all out and rename them and integrate them correctly.