It was possible to use html tags to format text in Skype before. As of version 5.8 that feature has been discontinued, but Skype still displays this text correctly if sent from an older version of a client that still allows this kind of formatting. This suggests that there is probably a way to send this kind of text without using those old versions of clients that have performance issues on Windows 8. 

Is there any extension/add-on/application or any other way to send these messages now?