This document provides specifications for the Macromedia Flash (SWF) file format, including details about the file structure, tags, basic data types, display list, and control tags. It covers versions 6-7 of the SWF format, outlining new features such as file compression, Unicode support, named anchors, ActionScript extensions, audio/video formats, and improved documentation. The specification is intended for developers working with the Flash authoring and playback systems.