Use this program to convert the NASOS .dec files to ISOs
nNASOS1.8.rar - https://1fichier.com/?fvkn11ldw537qcdxodlw
Download nNASOS1.8 and extract the files into a folder.
And then drag the Wii game NASOS .dec to the .exe
of the program nNASOS1.8 , and you will get the ISO file