The .stk file extension is most commonly associated with the Stickfigure Animator software. Stickfigure Animator is used to create stick figure animations. The STK files contain bitmap images and different motions points for figure animation. These files are used to create a series of frames that animate the image. The STK files are then combined and saved in the animated GIF file format.
The .stk file extension is also used for HyperStudio stacks files, Personal Stock Monitor files, Sticker Store sticker files, RankTracker data files, CRiSP Harvest files, MetaMorph software stack files and Rail3D 2KD/2k3 stock and scenery model files.
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If you have additional information about the STK file format or software that uses files with the STK suffix, please do get in touch - we would love hearing from you.