CLK - Corel R.A.V.E Project File is a file extension that was designed by Corel R.A.V.E. This is an object based program which is all animated and can be used to design different graphics. You will also be able to use this program to design text, images and other objects which can benefit you some type of way. CLK files are mainly used to design animations and movies for different pages online. This program extension is similar to that of Adobe Flash. If you are not using R.A.V.E. then you will be unable to download this extension. It is very handy when you need it the most.