Microsoft is famously backwards-compatible, and support for RTF is still present in those programs which originally had it, like
Write, the included word processor in Windows since Windows 1 (replaced in Windows 95 with WordPad, which retains its features). But is RTF usable for its original purpose – interoperability? Can you open a reasonably complex Word document and save it as RTF, and then open it in LibreOffice? Can you save an RTF document from LibreOffice and open it in Microsoft Word without loss? Is Microsoft working to maintain RTF interoperability in order to promote cross-program document compatibility? No. To quote Wikipedia, “Microsoft has discontinued enhancements to the RTF specification. New features in Word 2010 and later versions will not save properly to the RTF format.”¹
1. https://en.wikipedia.org/w/index.php?title=Rich_Text_Format&...