Some devices have a different symbol file type that GIR_Editor cannot use, however neither nuvi 2597 nor zumo590 nor zumo 595 logos are affected. Perhaps you have a problem with GIR_Editor itself so to eliminate that possibility you should re-download it: [Only registered and activated users can see links. ].

But you posted initially a picture of GIR_Editor showing difficulty parsing a file named "logo_2597.bin" of which i requested a copy. So why are you now dealing with zumo logo bin files?

I am totally confused what you are doing and why. On the assumption that it's the same file in your first post, i've downloaded the file from Post#2 (logo_2597.zip) to get logo_2597.bin and it opens normally in GIR_Editor:
Spoiler: Image
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And here's the zumo 595 logo from that other thread you linked:
Spoiler: Image
[Only registered and activated users can see links. ]