If your PC opens the HXK file, but it's the wrong application, you'll need to change your Windows registry file association settings. In other words, Windows is associating HXK file extensions with the wrong software program.

Make this lower case
if your pc opens the hxk file, but it's the wrong application, you'll need to change your windows registry file association settings. in other words, windows is associating hxk file extensions with the wrong software program.