A kp4 file extension is related to the Kai's Power Tools and used for its preset files.
KP04 file extension - Kai's Power Tools preset
What is kp04 file? How to open kp04 files?
File type specification:
The kp04 file extension is used by Kai's Power Tools, a set of API plugins created by Kai Krause designed for the use with Adobe Systems Photoshop and Corel Photo-Paint application. Kai's Power Tools were later sold to Corel and the application is no longer supported.
This kp04 file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.