Lost World/System Freeze

Last night (Aug.9) my world suffered serious leg where I could place and destroy blocks but they would not be visible. Sounds and animations still worked. Shortly after my whole computer froze up so I forced the computer to shut down. Today the world no longer shows in my world list, but it is in the file location for saved worlds. I have tried restarting Minecraft and my computer but the world still will not show up in the game list. I have attached a copy of the world's folder below.