If your WKF file is a music composition file from KeyKit, your goal is to convert it to Standard MIDI File (.mid) or notation software.
Open the file in Hexagon VISI and use the Save As or Export function. wkf file converter
You will find dozens of websites claiming "Free Online WKF Converter." Most are scams, adware traps, or fake download buttons. If your WKF file is a music composition