.HKM File Extension
What is an HKM file?
Movie or animation created with Havok game development software; typically a 3D physics animation or similar type of video; can be viewed with Havok's Visual Debugger, a cross-platform performance diagnostic tool.
Havok programs include Havok Behavior, Havok Physics, Havok Animation, Havok Cloth, and Havok Destruction. The Havok Physics and Havok Animation downloads are sponsored by Intel.