This is what i meant by 'GMapTool' info [but your images are most informative]:
Code:
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I assume that's the size of your image shown in red above, because you mentioned 3.2GB, but as it's length is actually 3,165,061,120 bytes that's either ~2.95GiB (Gibibytes) or ~3.16GB (Gigabytes) depending on whether measuring in binary [GiB] or decimal [GB]. In any case it's way above the FAT16 file size limit of 2Gib-1 byte [2,147,483,647 bytes] and the img file is clearly seen and usable by the software. Version 5.00.7g must therefore be limited to the FAT32 file size limit of under 4GiB not the FAT16 limit of under 2GiB on that evidence.

Interestingly, GMPC displays the size of the map as -863.6MB [actually it's MiB] which is the difference between the 4096MiB/4GiB file size limit and the actual size of the map [~3,232.4MiB or ~3.16GiB].

Thanks for your interesting and informative post, it's much appreciated.