I have something strange and can't figure it out by myself. I have 2 maps in my saves that I can't open. I have played on them, but one time they where gone so I searched for them in the Minecraft folder, and found them. There was nothing strange with them, so I don't really get it. Does anybody have an idea about what's wrong?
EDIT: Mrlemon is right, I found them in the map but can't open them in Minecraft itself. I compared the 2 maps with one that I can open in Minecraft (and see) but don't see a difference in between those. Here are some screenshots of it.