Movie player or file manager with thumbnail view

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http://androidforums.com – I'm looking for a movie player or file manager for my kids, so they can easily find movies just by looking at thumbnails. Movies are placed in separate folders with a folder.jpg for each movie on my NAS. Found Kids Movie Player https://play.google.com/store/apps/details?id=com.vcastroi.kmplayer&hl=en but I have to put all movies in the same folder and rename all folder.jpg to "movie-title".jpg. (General)