The Mac checks to see if the ISO is read only and errors if it is not.
It creates a Apple Mac OS 9.0.4.ISO file.
Use 7zip to unzip the Apple Mac OS 9.0.4.7z file.Rename the newworld86.rom to “Mac OS ROM” with no extension.Copy the newworld86.rom to the SheepShaver directory.SheepShaver comes with MAC OS 9 ROMs that don’t work.Download “ gtk2-runtime-2.24.10-ash.exe” – you will need these.Download “ Apple Mac OS 9.0.4 (ISO)” version 9.0 (and not 9.1 or 9.2).Download and unzip “ New World PPC ROM“.Download and install SheepShaver in a directory called “SheepShaver”.