.stp file: how to open it on Windows

11 Windows apps register the .stp extension. Install one of them to open the file with a double-click.

About the format

Format data: freedesktop.org shared-mime-info and PRONOM (The National Archives, UK).

Subtitle Edit
Subtitle Edit is a free and open source editor for video subtitles.

Open source 5.3.0.0 96.1K ↓ ★ 14.7K
OpenMPT
A powerful audio application that makes writing music fun, easy and efficient.

Open source 1.32.11.00 19.4K ↓ ★ 790
Notepad3
Notepad like text editor based on the Scintilla source code.

Free 7.26.602.1 84.4K ↓ ★ 6.7K
Winamp
The legendary Winamp desktop player for Windows

Proprietary 5.92.0.10042 47.1K ↓
FreeCAD
A general purpose open source parametric 3D CAD modeler

Open source 1.1.4 ★ 34.6K
VariCAD
A comprehensive, powerful, and easy to use 3D/2D CAD system for all aspects of mechanical engineering design.

Proprietary 2026-2.04
Sublime Text 4
Sublime is a sophisticated cross-platform text editor for code, markup and prose.

Proprietary 4.0.0.421500
VariCAD Viewer
A viewer, converter and printing software for 2D DWG, DXF, 3D STEP and 2D/3D VariCAD file formats.

Proprietary 2026-2.05
ODA Viewer
ODA Viewer incorporates the power and flexibility of ODA into a single application that can visualize all ODA supported file formats and illustrate other visualize-related features like visual styles and markup.

Free 27.9.0
STP Viewer
A professional tool for viewing CAD models with outstanding speed and quality.

Free 2.3
TinManX1
FibreSeek-focused 3D-printing slicer based on Orca Slicer.

Open source 2026.8.4.1