For example, the file I used in the guide was: “hero_00.msh” …but the .mif that is generated by the Viewer actually ends up named: “hero_00_body.msh” becuase of the header in the mesh’s .mif data.
Not sure what went wrong there on your end as it has been explained correctly…
You never want to rename the .mif or else the Viewer won’t relate it to the specific mesh. That’s the whole point of the Viewer generating it instead of making one from scratch so you get the correct file name.