Convert prj to 3mf

What is the difference between .prj and .3mf?

Description: PRJ (3D Studio Project) files are project files used by Autodesk 3D Studio, a 3D modeling and animation software. These files contain information about the scene, such as the objects and their properties, as well as camera and lighting settings. They are used to save and load 3D projects in 3D Studio.; 3mf is an additive manufacturing XML-based file format. 3mf files hold data on color, material, and all other details that can't be stored in the STL format.

MIME Type: application/x-autodesk-3ds; application/vnd.ms-package.3dmanufacturing-3dmodel+xml