That is a thumbnail file that is hidden but you can delete it, it will rebuild it's self, but otherwise it's a normal file listing.
Okay now hold the ctrl key down while you move your mouse wheel to increase the size of the thumbnails,
When the thumbnails are large enough they will start to show the actual photo files.
Or look at the top right side next to the question mark there are two other symbols,
The far left on has a down arrow symbol,
Click on it and click on at least medium icons.
Your set on small icons now they will need to be enlarged before a photo will appear.