Viewing Pictures with CDA Viewer With the CDA Viewer, you can view pictures you create with Paint. The CDA Viewer lets you look at Compound Document Architecture (CDA) files on your screen. The default file format for the CDA Viewer is DIGITAL Document Interchange Format (DDIF). DDIF is a standard format for the storage and interchange of compound documents. Compound documents contain multiple elements, for example, text and graphics. Additional topics: * Saving a Picture * Printing a Picture * Exiting Paint * Overview of Paint