Files with kpg extension were used by Kai's Power Tools Goo graphics filter. They contain some graphics data.
KPG file extension - KPT Goo graphics file
What is kpg file? How to open kpg files?
File type specification:
The kpg file extension is associated with the Kai's Power Tools Goo graphics filter for Adobe Photoshop and Corel Photo-Paint. The .kpg file stores graphics data created by the Goo.
The Kai's Power Tools were sold to Corel.