CabPack CabPack is a freeware compression program with which you can create cabinet (.CAB) files. With just a few mouse clicks you specify which files to compress, which compression method to use, where the output files should go and whether or not the cabinet files should span multiple disks. CabPack is able to store subdirectories, and depending on the platform you wish to extract the cabinets on, it can create .CAB files that contain long filenames or store these long filenames in the 8.3 format.