Files with the .CLK extension contain projects created using the Corel R.A.V.E. software, including the animation settings, as well as information about objects, texts, images, buttons, and custom shapes. The app was used to create graphical animations that were based on objects. Files of this type are often used when creating animations meant for use in webpages.

Adobe Flash is a program that is similar to Corel R.A.V.E., though it also allows for the exporting of videos into the Adobe SWF format. The development of the Corel R.A.V.E. application ended with the publishing of its 3rd version, which is part of the CorelDRAW Graphics Suite version 12, published in 2004.