Why won't my PS3 load a Minecraft map that I downloaded from the Internet?

I downloaded this map off of the Internet for my PS3 so that I can play Minecraft on a certain world I know I downloaded it correctly in my PS3 data it says the world is there but after I load my game it doesn't show the map why is it doing this

Guest

You can't do this. The PS3 will only recognize game files you downloaded from PSN. Anything else is ignored.

PoohBearPenguin

Its a p: file it won't work no matter what

Tim