.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 and edit the mesh a PSK file contains in Autodesk Maya (cross-platform) or Autodesk 3ds Max (Windows). You can view, but not edit, the mesh a PSK file contains in Blender (cross-platform). You may have to install plug-ins or add-ons to open PSK files in these applications.

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 convert a PSK file to an FBX file in Autodesk 3ds Max or Blender.

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Programs that open or reference PSK files

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