Can't insert UTF-8 strings into docx. Charset options don't help.

I'm trying to insert UTF-8 encoded strings (non-ANSI characters) into UTF-8 encoded docx template but it seems OpenTBS treats them as single byte strings - inserted strings appears as doubled amount of strange symbols.
Nor $TBS->LoadTemplate($template, 'UTF-8') nor $TBS->SetOption('charset', 'UTF-8') helps. And, by the way changing this option to another values causes no effect at all.

OK, got it ) http://www.tinybutstrong.com/forum.php?thr=3129