Hello marklaugz
There is a problem with Excel files and UTF8 in RosarioSIS if I am not wrong.
Apart from obviously installing first the Chinese fonts/language on your OS, so it can display chinese characters at all, and trying to open your Excel file as UTF8 encoded, you may have better results exporting to LibreOffice (CSV).
Please post here your solution or open an issue at Github with the exact steps, configuration and files so we can reproduce your problem.