oddity with the roms i download

most of the roms i download from this have more than 1 file in them and all of the files apear to be full copys of the games however the extras have things like [b1], [b2] [f1] and [t2] at the end of the filename. and as far as i can tell they are the same thing but if that were the case why isn't there only 1 file in the rar instead of the 3+ i usually get. can someone please explain this to me

 

Just make sure you get the one that ends with .nds

 

Kirby 64 - The Crystal Shards (U) [!].z64<--------here is the normal file
Kirby 64 - The Crystal Shards (U) [b1].z64<------explain
Kirby 64 - The Crystal Shards (U) [b2].z64<------these
Kirby 64 - The Crystal Shards (U) [f1].z64<-------for
Kirby 64 - The Crystal Shards (U) [t1].z64<-------me

 

I don't really understand what you are saying.
Old games include Rom hacks and others.
The [!] one is the clean rom.

 

so they are hacked versions of the game then?
and if that is the case how do i find out what the hack is?

 

This thread explains those tags.

 

thx