How to open the hidden files in the macbook air?

Hi,
I am not able to open the hidden files on my external disk. COuld you pleasee how to open?

Thank you
I deleted the whole disk. When I start the computer I press Command+R and appears the earth planet and all the networks detected by the computer. What I don´t understand is that I have a MacBook and an iPad beside the Macbook Air and both recognize the network, but the MacBook Air can´t.
I tried to use an external drive with the Macbook leopard OS but the MacBook Air didn´t recognize too.

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