Retro snes multiple roms packaged ... what are they?

When I download snes roms from romulation.net I get multiple copies of the same rom packaged such as :
Rock N' Roll Racing (U) [t1].smc
Rock N' Roll Racing (U) [hI].smc
Rock N' Roll Racing (U) [f1].smcEvery rom packaged got similar but diferent such notes at the end of them.
What are they and in general wich version would the best ?

Replying to #1

[t] is a translation-followed by a few letter of another ie "fre" for french.If your an english speaker/reader [E] or [U] followed by [!] or just ! works.E and U are english regions-E for europian regions (UK Australia, etc and U is american.Use the one's with [t] if you use other languages.

Thanx a lot for the info !
So I want to play (U) english versions so I'll go for the [E] or ! versions.
In Rock' N' Roll Racing download there are no [E] or !, but there is a plain (U).smc version so I guees I would go for that one.Then what would [hI] or [f1] means ? some other translation ? [f1] for a french translation ?
Thanx again for the help it is much appreciated and saves me the time of going through every single version and check the diffrences.

Replying to #3

Some are beta and test files of the same game.(U) and (E) are only different in region content...The (U) or super metoid had japanese and english language select-but the (E) has german instead of jap..Usually, the best to choose is the (U)! or (E)!.The (!) at the end just defines it as the perfect dump.(t) with a letter after defines it as translation-the number next to the letter is what version of it.(f1) is the first french traslation.(b1) is a beta-previously un-released-may have beta test options in some games-like a cheat menu with exclusive stuff XDSome game sthough.Stick to those which have ! after the main letter.

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