Help (Im a rookie at this)

[XIII]

I Found some games and to DL it it has file1 file2 file3 ect..what does that mean, so anyways i just picked 1 after it completes it says "open with.." (By the way I have DJ3,nero,winrar,isobuster,dummyfile,cdrwin,firebur ner) what do i do.
If anything email me mr_magicx3**********com for exact details.