@boz
Obviously you're correct and from somewhere he's downloaded some image made by that guy mafozi. I dunno who he is but his images are usually 'interfered with' by adding his name to the mapset like that, also they're often lazily or intentionally left with MsFlag 1. It's probably from a torrent and it's also probably the full NA again which is oversized and cannot be seen by GMPC. I suspect that because of the minus sign in from of the map size [-1930.0 MB] which was discussed here earlier in the contact of an oversized CH map displaying as -863.6 MB when it's true size was 3.19 GiB [about 3431.4 MB]. Using the same calculation method described in [Only registered and activated users can see links. ], the size of themafozi image would be ~2365 MB or ~2.365 GB [decimal] which in binary is 2.2 GiB and 10% over the FAT16 file size limit of 2 GiB minus 1 Byte.

@stealthr
You simply must either make your own image under 2 GiB from the gmap folder you have installed using MapInstall to select tiles. MI will tell you the size used in 'MB' [actually it's MiB] like in this pic:

NA 2015 10 Reduce Below2 Gi B

Just don't select any more tiles past 2,047.9 'MB' [MiB] or 1.99 'GB' [GiB] as exampled above and it'll be under the limit.

Or download another ready compiled image of the areas you need but be sure it's been kept under 2 GiB file size.