Gmap is a folder that contains the Mapsource standalone installation , it doesnt contain the gmap3d.img, you must download it from here
[Only registered and activated users can see links. ]
3d building map is the same in the latest CNE. 3d buildings are visible just in gps not in MS.

If you have the Gmap folder you dont need GmapTool.
To install the map in Mapsource copy the Gmap folder in
(in XP - C:\Documents and Settings\All Users\Application Data\GARMIN\Maps) or
(in Vista, Windows 7 - C:\ProgramData\Garmin\Maps)

some more infos
[Only registered and activated users can see links. ]
[Only registered and activated users can see links. ]