Auto-saved documents are saved with the same encoding as the original document. By default, untitled document will be created as the system default encoding (Western European for European Windows, Chinese for Chinese Windows, etc.), and thus Unicode characters will be lost. To work around this issue, please go to configuration properties for Text, select the File page, click the New Files… button, and select UTF-8 form Encoding drop-down list box. This way, new untitled documents will start as UTF-8 encoding.
I might actually consider making UTF-8 as default encoding for future versions.
Thanks,