Files with mkf suffix can be found as karaoke music files for Karabox software.
MKF file extension - Karabox music
What is mkf file? How to open mkf files?
File type specification:
File extension mkf is related to Karabox, a range of Karaoke music solutions from NesyLine.
A typical .mkf file contains Karaoke audio data - karaoke music - playable in Karabox.