Details for file extension: CDW - CADKEY Organized Dialog File (CADKEY):: CDW - CeledyDraw Drawing (Celedy Software Inc.):: CDW - KOMPAS Drawing. We explain what CDW files are and recommend software that we know can open or While we do not yet have a description of the CDW file format and what it is normally used A file extension is the characters after the last dot in a file name. The extension . CDW refers to files of the type Kompas document files. This is a program used for creating 3D rendering and modeling in manufacturing industry.