STP file (or STEP) files can be accessed through an STP file viewer, which is a 3D modeling software. These are a few programs that can open STP files: Dassault Systèmes CATIA, Siemens Solid Edge, IMSI TurboCAD, Kubotek Keycreator, ABViewer, ShareCAD, etc. With the use of this software, opening STP files is made simple.
