Opening STP files

Have a problem opening a .STP file? We collect information about file formats and can explain what STP files are. Additionally we recommend software suitable for opening or converting such files.

What is the .STP file type?

The .stp extension primarily represents the STEP 3D Model (.stp, .step) file type, with reference to the STEP-File file format (ISO 10303-21, Clear text encoding of the exchange structure). STEP (Standard for the Exchange of Product model data) is an international ISO standard (ISO 10303) for exchanging three-dimensional Computer-Aided Design (CAD) data. A STEP (.stp, .step) file is a two-part text document, comprised of the 'header' and 'data' sections. The 'data' section contains a long list of Parasolid-based geometric primitives, to be rendered into a 3D model by a compatible CAD application. Being text-based, STEP files (.stp, .step) can be directly opened in a text editor on any platform or OS.

In addition to the native STEP import capability present in virtually all CAD and 3D modeling applications, STEP models (.stp, .step) can be opened by several standalone viewers or converted to other CAD formats (DXF, STL, etc.). Some CAD applications like IDA-STEP allow to directly work on STEP models. Manufacturers often provide STEP models (.stp, .step) of their products to facilitate systems design.

Alternatively, the .stp extension represents the MOSS 2007/WSS 3.0 Site Template (.stp) file type. MOSS 2007 (Microsoft Office SharePoint Services 2007) and WSS 3.0 (Windows SharePoint Services 3.0) are Microsoft's web site deployment and collaboration solutions that allow to use templates and save them as .stp files. The .stp file is a regular CAB archive with a different extension. When it is renamed to .cab, its contents can be explored or extracted with any archive manager. Since Microsoft SharePoint 2010, the .stp template format is unsupported, and the new Web Solution Package (.wsp) format is used for site templates instead. There are methods of converting existing .stp templates into WSP that involve setting up a virtual machine or directly editing XML files inside the .stp (CAB) archive.

The Adobe RoboHelp help, knowledge-base, and e-learning content authoring software by Adobe Systems uses the .stp extension in association with its Adobe RoboHelp Stop List (.stp) file type. In RoboHelp, a stop list (.stp) contains common words that should be ignored to produce more sensible search results. For each language used in a RoboHelp project, its stop list is saved as a text-based .stp file inside the corresponding subfolder of the "!Language!" directory in the project's root (e.g., "My_project\!Language!\en-US\My_project.stp").

Besides, the .stp extension is associated with the SYSTRAN Translation Project (.stp) file type, representing a proprietary file format developed by SYSTRAN Software for their commercial Computer-Aided Translation (CAT) tool SYSTRAN. In a translation project file (.stp), the language pair and translation direction are defined, project metadata is stored, and external references for the project's resources are provided. SYSTRAN projects (.stp) can only be opened in the SYSTRAN Translation Project Manager (STPM).

In relation to Quartus II, a powerful PCB (Printed Circuit Board) and circuit design tool by Altera Corporation, the .stp extension denotes the SignalTap II File (.stp) file type/format. Here, the .stp file acts as a storage for signals captured by the SignalTap II Logic Analyzer. Such .stp files can only be opened in Quartus II.

Software to open or convert STP files

You can open STP files with the following programs:
STP Viewer
STP Viewer by IdeaMK
ABViewer by CADSoftTools ®.
QuickVerse by Findex

Popular formats