Comment 1 for bug 480898

Where are you initiating the download from (search, sharebrowser)? Does the filename show up properly in the GUI while searching/browsing share/downloading? If it's in a file list can you extract and open the file list and ensure the filename is in the encoding that the xml states in its header (use iconv)? If encoding is missing the parser defaults to utf-8. It's possible that the file list says it's utf-8 but is actually in CP1251 or KOI8-R in which case the character conversion will fail for non-ASCII characters.