What happened to bpy being able to read in meshes besides stl?

I’ve been working on some code to ‘skin’ meshes , this works so far but it seems I can only read in stl files. I’m sure there used to be a function to read in exodus files? Does anyone know where I might find that old code that hopefully wouldn’t need much updating?

Or can anyone recommend a way to convert between exodus and stl files? When I search I just see sites to convert online with suspicious names so I’m a bit reluctant to try them!