After that I selected the new LNG file in TC, restarted TC (to be sure). But when I press F1, the standard English help file is loaded instead of WCMD_RUS_NEW.HLP.WCMD_RUS_NEW.HLP
WCMD_RUS_NEW.INC
WCMD_RUS_NEW.LNG
WCMD_RUS_NEW.MNU
When the names are short (WCMD_RUS.*) all works fine, and WCMD_RUS.HLP file is opened.