KDC files contain the native image format for DC-40, DC-50 and DC-120 Kodak cameras. ThumbsPlus uses libraries provided by Kodak to read these files. ThumbsPlus does not current interface with digital cameras directly (except via TWAIN, where available), though we are considering the possibility in the future.
Image information (exposure time, F-stop, etc.) are available both as comments of the image in the view window (Edit | Edit Comments), and are displayed as file details in the File | Properties - Details dialog. Different DC camera models provide different information.