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CREO Viewer
open ASM and PRT files

CATIA Siemens-NX CREO SolidWorks Solid Edge Inventor Rhino JT STEP X_T DWG-DXF IGES-SAT-VDA 3MF-STL PLY-3DS-WRL-OBJ

What are PRT and ASM files?

  • The file extension PRT is used by several programs. In the CAD/CAM area, these are native 3D models from either Creo Parametric or Siemens NX. Creo files can often be recognized by a number after the file extension (*.prt.1, *.prt.2).
  • The ASM file extension is used in the CAD/CAM area of Creo Parametric or Solid Edge. Creo files can often be recognized by a number after the file extension (*.asm.1, *.asm.2).
  • PRT is the part file format and contains 3D geometries and sometimes also Product Manufacturing Information (PMI)
  • ASM is the assembly file format and is linked to at least one, but usually several PRT files and often also to other ASM files.

CREO-Viewer for PRT and ASM files

Creo Versions

Creo Parametric is the successor to Pro/Engineer. Pro/Engineer was the first parametric 3D CAD system in 1988. From 2002 to 2008 it was called Pro/Engineer Wildfire and since 2009 it has been part of the Creo suite. PRT and ASM created with newer Creo Paramerics versions cannot be opened with older versions. The current version is Creo 11. (06/2025)

Creo Elements is another application in the Creo suite. It is a so-called "direct modeling software" and a further development of CoCreate. Creo Elements has its own native file formats.

Creo View is a family of viewers for visualizing Creo 3D models and 2D drawings.


Additional Native Creo File Formats

  • xpr, xas Optional accelerator files for part variants (xpr) and assembly variants (xas). Serve to optimize performance, but are required by some applications to display variants correctly.
  • drw Native 2D drawing from Creo Parametric
  • pvs, pvz Creo View files, contain product visualizations of the PTC Creo Viewer.
  • bdl Creo Elements Bundle-Datei, enthält ein 3D-Modell und zugehörige Zeichnungen.
  • pkg Creo Elements bundle file, contains a 3D model and associated drawings.

How do I open Creo PRT and ASM Files?

Typically, a Creo installation is used for this. It is also possible to open with CAD/CAM software that has a Creo interface.

The free Creo View Express supports native Creo Parametric parts (prt) and assemblies (asm), but offers no markup capabilities and only simple distance and length measurements.

In addition to PRT and ASM files, the 3D-Tool CAD viewer opens many other CAD formats and offers extensive measurement and analysis functions.

How do I convert Creo ASM and PRT files?

If you do not have CAD software with a Creo interface, the models must be exported from Creo to a common 3D exchange format, such as STEP.

Converting CREO ASM and PRT to STEP is also possible with a 3D converter or CAD converter.

3D Tool Premium includes the 3D NativeCAD Converter. In addition to native CREO models, this converts models from many common CAD systems into the 3D exchange formats STEP, IGES, SAT and Parasolid X_T supported by many CAD/CAM programs.

Test the Creo Viewer and Converter

3D-Tool is a CAD viewer with many native CAD interfaces and professional measuring functions, demolding analysis and wall thickness analysis.

  • Open, dimension, markup and publish PRT and ASM for the 3D-Tool Free Viewer or as 3D-PDF
  • Open PRT and ASM and save as STL, 3DS, PLY, WRL, OBJ, or PLY
  • Convert PRT and ASM to CATIA, STEP, IGES, VDA, SAT and X_T
  • Convert CREO models into 3D product visualizations such as 3D-HTML, FBX, Collada, 3MF, and glTF.

Free and non-binding 14-day test with all functions, the Creo interfaces and the 3D-NativeCAD Converter. The trial key activates all 3D interfaces, such as Siemens NX, SolidWorks, Inventor, STEP, SAT, Parasolid.

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