3906 Open Packaging Format 3 Audio The Open Package file with the extension opf is a format used by the openebook group (https://openebook.org/). Daisy Talking Book v.3 packages must include an opf file if they are to conform to Daisy standards. 299 Brigham Young University / Brigham Young University 29 Jan 2025 29 Jan 2025 fmt/2032 PUID opf File extension 3395 Open Packaging Format BOF, offset 0-3 magic bytes: {0-3}<?xml version=("|')1.0("|'){0-256}<package*openebook EOF offset 0-16: </package> 1 Absolute from BOF 0 3 3C3F786D6C2076657273696F6E3D(22|27)312E30(22|27){0-256}3C7061636B616765*6F70656E65626F6F6B 1 Absolute from EOF 0 16 3C2F7061636B6167653E Has priority over 638 Extensible Markup Language