tmd to rtf conversion is typically searched by users that got TextMaker document (.tmd), do not have access to the software and need to export it to some generic document format (for example RTF) they can use in another software.
Unfortunately, TextMaker's formats are notoriously not supported in other word processors, which means you either have to get the software yourself or find someone who already owns it and would be willing to make the export for you.
Updated: October 12, 2023