Romcenter

Hi,
Im new to this romcenter thing, and i have jsut used it on all my roms, but some say "Unknown Rom" and they cant be renamed.
I know they work casue ive been playing them.
These include Donkey Kong (1,2,3) and Bomberman.

Some one plz help, ive tryed the help file but still cant work it out.

Thanks

Need a little more information:
What datafiles are you using?
Are they up to date?
ect.

i got nearly same problem:

But there are other versions outside...

-Mike-