This is a vector imaging format used in the CorelDRAW editor. It has a template that can be applied for other designs, including styles, grid parameters, page layout and other parameters. The CDT template allows for the creation of several images in one style without changing the settings in manual mode.
The VIFF file type is primarily associated with VisiQuest by AccuSoft. The Khoros Pro product line was taken over by AccuSoft Corporation and a newly-branded release of the Khoros Pro product line is now called VisiQuest.