In case it is of help, I put a 213 byte file here: http://www.shoalhaven.net.au/~glenalec/zh_test.tar.bz2 which contains a text file with the filename in Chinese. Afain, in my partner's account, Ark displays this correctly, but in mine it doesn't.
To display UTF8 (8 bit UniCode) file names, you have to set environment variables. If you have LC_ALL=C (use default language for all LC_*) then you need to set: LANG="en_us.utf8".
This would normally be set (on Linux) in the script: "/etc/profile.d/lang.sh".
E.G.:
------8<------8<------8<------8<------8<------8<------8<------8<------ # /etc/profile.d/lang.sh
LC_ALL-C LANG="en_us.utf8"
------8<------8<------8<------8<------8<------8<------8<------8<------
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