[nounette]

Ok, I've found the information by myself in another topic (Map Builder Trick with JSGME.exe) http://allaircraftsimulations.com/forum/...70&t=28901

Basically, to save your work, you should have in your game folder a folder named : Maps and in this folder, other folders with EXACTLY the same names than your maps folders in your mods/mapmods/maps/..
So, the work you do will be saved in this [your game]/Maps/[your map]/... but only the files which are updated in your work.
In order to to have the changes taken in account, you'll have to move files from
[your game]/Maps/[your map]/...
to:
[your game]/MODS/Mapmods/Maps/[your map]/...

Now everything works

N