It's very old theme...
Many years ago we have defined a .NET wrapper around Windows Uniscribe API.
Uniscribe API is used to render bidirectional languages like Hebrew, so it's important mainly here in Israel.
Once in a while we get request from people to give that API, so we published it on GitHub at https://github.com/nesterovsky-bros/BidiVisualConverter.
You're welcome to use it!
a@href@title, b, blockquote@cite, em, i, strike, strong, sub, super, u