Convert x3db to stp

What is the difference between .x3db and .stp?

Description: X3DB is a 3D graphics file format used to represent 3D models and scenes using the X3D standard. It is a binary format, providing higher compression and faster loading times than the equivalent X3D XML format. X3DB files can be used to represent characters, environments, and objects, and can be opened and edited using a variety of 3D graphics software.; STEP is a neutral ISO-standard 3D file format that is used to transfer data between different CAD programs.