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by vram22 2063 days ago
sidpatil answered (sibling comment). The RTF spec was freely available (on MS's site and/or MSDN CDs then) and should still be around, at least on some sites, since RTF is still used a lot as an exchange format between word processors and even other software. So you can read the spec; it is straightforward.

RTF is to Word like CSV is to Excel. In fact, we generated RTF because the output was to be input to Adobe InDesign.