COMPUTE!’s Data File Handler for the Commodore 64 by Blaine D. Standage, John L. Darling, and Kenneth D. Standage is a 1985 guide and complete software package for managing structured data files on the Commodore 64 and compatible PET/CBM computers. Built around a coordinated set of BASIC and machine-language programs, the system lets users create, edit, sort, list, print, merge, restructure, split, and extract records containing up to 20 fields, making it suitable for applications such as card files, genealogy records, mailing lists, and other personal databases. The book also includes the independent DFH Editor for working directly with sequential files and expanded disk-operation commands, explains file design and important Commodore disk-safety issues, provides reusable machine-language subroutines, and supplies full program listings plus entry aids such as the Automatic Proofreader and a machine-language program generator.