9 file types use the .prt file extension.

What is a PRT file?

A PRT file is a part created by PTC Creo Parametric, which is part of the Creo CAD suite. It contains information used to record the part's structure and show it as a 3D model. Creo users often combine PRT files into Creo assembly ( .ASM ) files.

More Information

How to open a PRT file

How to convert a PRT file

Category: CAD Files

Valve Source Portal File

A PRT file contains portal information used by the Valve Visible Information Set (VVIS) command-line tool included with Hammer Editor, which is a program used to build maps for Valve games such as Half-Life. It stores a list of portals in ASCII format that are used by VVIS to perform visibility calculations to determine which objects on a map can be seen by a player and must be rendered.

PRT files are used to optimize maps/levels in Source engine games. The PRT files are generated by VBSP, which is a tool used to compile raw Valve Map .VMF files to the Binary Space Partition (BSP) format so that they can be used in BSP-based game engines. These .BSP maps must be completely "sealed," meaning that they cannot connect to the black infinite area around the map. If the maps are not completely sealed, they will not work properly in the game.

If the level is sealed, then VBSP creates a [mapname].prt file, which is then used by VVIS to calculate the visibility of objects and improve the performance of the map by communicating which objects must be rendered. If there is a "leak" in the map, then VBSP reports it and does not generate the PRT file, which causes VVIS to not perform the visibility calculations.

NOTE: Since PRT files are saved in a text format, you can open them with a text editor, such as Microsoft Notepad or Apple TextEdit. However, you may have to change the .prt file extension to .txt to open it in the text editor.

[mapname].prt - PRT files are named after the map/level for which they store portal information. An example of a PRT file name is d1_canals_06_d.prt .

Programs that open or reference PRT files

Updated: April 9, 2019

Presentations Template

Presentation template created by Corel Presentations, an application included with Corel WordPerfect Office; saves a slide style and layout that can be used for creating new .SHW presentations.

Programs that open PRT files

Updated: August 18, 2011

CADKEY Part File

CAD file created by CADKEY, a program used for designing 2D and 3D parts; contains both the model and drawing layouts; includes model geometry in wireframe, surface, and solids (ACIS based), plus dimensioning, annotation, vector, plane and other entity types in one modeling space.

The Drawing Layout Mode in CADKEY contains defined views of model geometry for associative dimensioning and annotation, as well as section views. It also allows 2D wireframe geometry creation.

NOTE: KeyCreator, the successor to CADKEY, uses .CKD files to store designs.

Programs that open PRT files

Updated: May 2, 2013

Unigraphics Part File

A PRT file may also be a model part file saved in a three-dimensional model format used by Unigraphics, a 3D CAD program. It contains surface and solid information for a single part. PRT files are saved in a binary format, similar to an Alias wire model and an SDRC (Structural Dynamics Research Corporation) model.

NOTE: Unigraphics was acquired by Siemens and is now distributed as Siemens NX.

Programs that open PRT files

Updated: October 18, 2017

Solid Edge Part File

3D model created with Solid Edge, a CAD program used primarily for creating industrial parts and assemblies; can be combined with other 3D parts in an assembly ( .ASM ) file.

Programs that open PRT files

Updated: March 31, 2010

Printer Driver File

Contains configuration information that allows the computer to communicate with the printer; may be used by certain software programs, such as Dr. Halo software, which saves images in a device-independent format.

Programs that open or reference PRT files

Updated: April 24, 2007

Printer Output File

Output from a printing job sent to the printer and saved as a file; contains formatting information that tells the printer how the document should be printed.

PRT files may be created on Unix systems using the FILEUTIL function with a Filename parameter. They can also be opened by FILEUTIL and printed using the LP (line printer) parameter.

Programs that open PRT files

Updated: December 13, 2018

Crypt Edit Protected Text Format File

Protected text document created by Crypt Edit, a free program used for word processing; stores an encrypted and password protected document; may contain text, images, and page formatting information; used to securely store documents.

NOTE: PolySoft Solutions discontinued development for Crypt Edit in 2000.

Programs that open PRT files

Updated: April 15, 2010