The Rich Text Format (RTF) Specification provides a format for text and graphics interchange that can be used with different output devices, operating environments, and operating systems. Version 1.8 of the specification contains the latest updates introduced by Microsoft Office Word 2003. RTF uses the American National Standards Institute (ANSI), PC-8, Macintosh, or IBM PC character set to control the representation and formatting of a document, both on the screen and in print. With the RTF Specification, documents created under different operating systems and with different software applications can be transferred between those operating systems and applications.
Download: Word 2003: Rich Text Format (RTF) Specification, version 1.8