Which ROM is unaltered?

Sometimes when I download a ROM rar file theres a lot of files inside. How do I know which one is the unaltered original game?

if you can send a print screen it would be easier to help

oh, yeah, i remember it. all of them work, but some are hacks. i remember i once played pokemon red, but with sonic instead of ash. :Pthere's a file that has an exclamation mark (!) only. that is the unaltered file.

Replying to #3

thanks, you helped a lot

https://www.romulation.org/forum/index.php?topic=1359.0