Hi Neil,
Thank you for your time.
I ment: I installed CN middle East on my PC-windows 7 in programdata/GARMIN/Maps
Doesn't .system refer to Android or the like, or perhaps the GPS itself?

let's refrase my question: how to install a DEM .img file on a windows computer.

I'm actually not interested in installing it on my GPSmap 62: too small a screen and I need reading glasses for it but use the GPS off-road...