This is very odd. I’ve been doing it that way for years, and even copying and pasting an image from InDesign to Word for years and years. Now it’s not working.
I can’t test with CS6 as I don’t have that on my system any longer, but it definitely seems I can’t do it from CC and above (at least on my home machine).
I will check my work machine tomorrow as that’s the machine I’ve always done it on.
Looks like the art won’t export with the RTF. I think I had to export and file, and then go into the ID file and copy and paste the art to where it had to go.
Well, I don’t think InDesign Export RTF feature can export the images as well. The Export RTF feature is meant to export the text only for the purpose of proofreading or editing.
Secondly, to get the images along with the text, you can export the InDesign file to PDF and then export the PDF from Acrobat as RTF or Word Document.