How can I do GWAS with SNP array result in plink?

Question

[y1310]

Hello, I got some SNP array result data, and I have to do GWAS with it. It is formatted as '.txt', and it is zipped by '.gz'.

I only used the processed map-ped (bim-bed-fam) file, so I'm in very difficult situation.

What I only got looks like below.

Each file has the result of each person, so I have several files for several people. Do I have to merge them all first?

Please let me know, how can I do the GWAS with that file.