.PSK File

The psk file extension is related to Unreal Game Engine, a popular first-person shooter engine used in several successful game titles. 

The psk file contains character model data, such as the mesh, bone influence indices and weights for each vertex, the bone names, bone hierarchy, and skeletal default pose.

A psk file extension is associated with the Unreal Game Engine and used for its character model mesh files.

How to open:

You can work with these files in Unreal Development Kit. Some 3D graphics editors might also be able to work with the *.psk files.

How to convert:

Some 3D editors may be able to export *.psk files to other formats.