Make sure the name of the file(s) is correct. Don't use any spacing between names and don't use any special characters. You can use the underscore _ to separate words. Make sure all file names ends with -1. The -1 tells the player that this file is intended for monitor #1. This is more important when using multiple monitors for video walls and arrays.

Here are 3 examples, please note the D:\ is the head, or root, directory. Create a hidden folder if you'd like to hide files from being loaded automatically.