CDT, CorelDRAW Image Template (.cdt)
The CDT Settings file format
CDT files are associated with the image editing program CorelDRAW. However, CDT files are no raster or vector image files, but rather templates used in CorelDRAW. These template files are used to create multiple CDR files based off of the same template containing the same settings.
Technical details of CDT files
The CDT template file contains all properties needed by CorelDRAW to create a new image. It contains graphic settings, object fill settings, rulers and grids, guidelines, different styles and more.