There is only one file type that uses the .NK extension:
Script written for NUKE or NUKEX, a program used for creating high-quality film and animations; saves a set of instructions for composing an animation; can include node creation and steps for motion and effects; can be visually edited in the NUKE software or hand coded in a text editor.
NOTE: NUKE is used in many Hollywood animation films.
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Updated: September 1, 2013