File with a .CAD extension contains CAD data, such as 2 and 3D dimensions and the geometry of parts. They are used to store projects of designed products and parts. In the newer editions of the software, the format has been substituted by BBCD files.

CAD files are stored by the BobCAD-CAM software in many of its versions, up to the 21th. The software enables importing data into this format from other popular ones, such as 3DM, DSF, DWG, IGES, SAT, SLDPRT, STEP, STL, X_B, X_T.