I'm no Mac OS expert, i barely stumble thru with Windows. However I believe that's the custom drive icon shown when connected to a Mac. If it's already present, it should be visible in Windows if you set the radio button for 'Show hidden files, folders and drives' in Folder Options>View. I only mentioned it because as you've since confirmed you had 'Don't show etc' set, which i knew because .System wasn't showing in your earlier screenshot. Don't worry too much about it if you don't connect to a mac. None of the older units had it, but its been present since 2008 i think first in nuvi 765 and it's still in my 2013 3597.
BTW, that GUPDATE.GCD file is insanely small at 64KB. I would delete it because it should be ~16MB.
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