.PSK File Extension

Unreal Engine Skeletal Mesh

Developer Epic Games
3.9  |  12 Votes

What is a PSK file?

A PSK file is a mesh file used to create a 3D model in version 3 and below of Epic Games Unreal Engine. Developers import PSK files into Unreal Engine and combine them with .PSA files, which contain data used to animate a model.

More Information

The Unreal Engine is a video game development engine that has been used to create many popular video games, including Unreal Tournament, Borderlands 2, Mass Effect 3, and Fortnite. Developers using Unreal Engine versions 3 and below can import 3D model mesh data saved as PSK files into their projects.

Each PSK file contains a set of eight header-data pairs that define a mesh. These pairs include:

  • Head: Contains the file-level header
  • Points: Defines the mesh's vertices, or points
  • Wedges: Defines how textures are applied to the mesh
  • Faces: Defines the mesh's triangles, composed of vector structs
  • Materials: Defines the materials the mesh uses
  • Bones: Defines the mesh's bone structure
  • Weights: Defines how the mesh can deform while moving
  • Extra UV Maps: Contains additional texture-application data

In addition to creating their own PSK files, developers and modders can extract PSK files from existing games, using various third-party modding utilities.

NOTE: Unreal Engine 4 users create and import meshes saved as .FBX files.

How to open a PSK file

You can open PSK files with the following 3D modeling programs, after installing PSK-related add-ons:

A PSK import add-on for Blender is available here. Note that, while you can open and convert PSK files with Blender, you cannot edit them.

How to convert a PSK file

To import a PSK file into current versions of Epic Games Unreal Engine (Windows, Mac), you must first convert the file to an FBX file. You can use any of the following programs to convert a PSK file to an FBX file:

These programs can also convert PSK files to other 3D model formats. Remember that, to open and convert PSK files with Blender, Autodesk Maya, or Autodesk 3ds Max, you must first install a PSK import add-on.

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Programs that open or reference PSK files

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