We have support for special languages as Chinese, Japanese, Korean, Arabic, etc. on our to-do list, but we have not scheduled them yet.
By specification, some predefined CMAP files should be present in the PDF file to assure the correct rendering of files using these languages. In fact, there is a way to display Chinese characters in RadPdfViewer. The only thing to do is to provide an embedded CMAP that describes the transformation from charID to unicode character. For example, if you export Chinese text from Word, there should not be a problem with the way RadPdfViewer displays it.
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