What console ISO/ROM are you downloading? If it's PS1 or PS2, then they usually have extra files that come with them, not sure what they do but you should probably keep them in the same file.
If you're talking about the txt files then you don't need em.
"NintenDON'T sue me please haha"
There are files that I get from here that come with random files in them, there is no mention of putting them on the Retropie. Can some one tell me if I should be putting them on there with the roms they come with? I assume so, cause why else would they be there?