what is .diz or .sfv

[tempo123]

Hi, I am trying to have a few back ups from the net, my problem is : when I dowloaded a game and unrar it sometime there are other files as well on it. If I am right the game in itself is the one with extension .nds but sometime I found files with extension .sfv and .diz
Could you please tell me if they are important for the game and they need to be put as well into the micro?
Many thanks

[allycoops]

.sfv is a file checking type file to do with winrar.

.diz is a simple text file telling whats in the rar folder.

delete both after you have downloaded your rom file.

you do not need them and they don't go on your card

all you put on your card is the rom. (.nds)