Thank You for help! i've just found and read the tutorial but some link included on it are out of service! i've found the MAS utiliy in another way on internet, and i've found the gmt2 importer ( i don't know if it's the same) plugin, but it require isi tools and i can't find it on the web!! moreover, i have only one file called sky.mas file in the folder, and i don't know if it's correct! i've found 3ds 2017, it work on it?
but there are also a good news:
the track is beautiful! i've past beautiful eavenings with my friends, some meat and the barbecue!!