I'm not sure if this is going to work. I donxxx8217;t know what an RTF file looks like, but you might "MIGHT" be able to apply the following KB to your server. Just change the csv to rtf.
Article Number: KB-03820
(Can't post url because "You are only allowed to post URLs to other sites after you have made 10 posts or more.")
I would try this fix on a test server first.