Love to help you...but I'm just trying to figure out how to use Moodle in English!!!
iconv is a character conversion program on UNIX and Linux. Now, there may be a non-Moodle answer to try. Although you have the click link in Chinese on the Moodle page...name the file in English on the server and use the English name for the search pram. Therefore, when Moodle and the server goes to look for it, it is looking for a file named in english. It's may just be a matter of indexing it in English.
Hope this helps.