I ask if can i open the files .hdr with root?

if yes ; how i can do it, please ?

You mean this format ?
If it is this format the answer to your question is “no”.

Yes, it is .hdr, thank you

please how can i open the file.hdr?

As I said ROOT does not provide interface to this type of file.
If you search with google “how to read .hdr file” many possible answers show up.

okay thank you so much