Files with dkp suffix can be perhaps as old plugins for Dreamkeys tool used to define keystroke combinations.
DKP file extension - Dreamkeys plug-in
What is dkp file? How to open dkp files?
File type specification:
File extension dkp is mainly related to Dreamkeys, an older program that allows users to define they own keystroke combinations. It seems like the program is no longer developed.
A .dkp file used in Dreamkeys contains some sort of plug-in.
This dkp 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.