In general, Java application including Confluence needs addtional font files to display the multibyte characters on its GUI. For example, to display Japanese characters in ppt file with Viewfile macro on Confluence/Linux, we have to install Japanese font files (msgothic, msmincho, ipa) into "JAVA_HOME/jre/lib/fonts/fallback/" .

But even deploying Japanese font files into "JAVA_HOME/jre/lib/fonts/fallback/" which Confluence uses, viewfile macro can't display the Japanses characteres in TextBox of Word (doc/docx).
(ASCII characters which is included in same fonts tyoe are displayed as expected in TextBox correctly)

It seems there are something wrong in Confluence libraries.

Regards,