Romcenter

well, i think i get it, at least i was a developer, there is nothing i can do
i know how to use romcenter, but the most of the games i have are old
and have missing files or diferent CRC, but it's ok
i guess they can't do roms like does ones for the nes or snes.
it's pretty sad, but developers do a ...

i am new here, and i was like studying the romcenter and i realize that some games has missing some files, but the files was there but with a diferent CRC.
my question is, if there's a software that can change the CRC of the roms.

i download aerofighters 3 from rom world and i try it to use it on ...