Minecraft world won't show up in game even though it is in the saves folder

Question

How could I recover a world I have the file for, but won't show up in game?

Answer 1

To add a Minecraft map to show up, follow these instructions:

1. you need to have the map

2. open the file so that the file looks like this

3. drag the file to your saves folder

Tell me if this works, because it should.