Sorry for the missing elements !
I just wanted to get a jpeg or tiff or something equivalent to this format to visualize it in matlab (and do some operation after).
As both of you suggested, I use Gdal (by setting Gdal in my variable environement) and next using this command line in an anaconda prompt :
gdal_translate -of "Gtiff" in_FileName.ext1 out_FileName.ext2
With ext1 the extension of the File to "transform" and ext2 the extension (for the format) you want (jp2, tif...).
Thank you for your help anyways !