I'm trying to edit text file from FTP server. Text file is in UTF-8 encoding with text in Russian. File name also contains cyrillic characters (server is FileZilla and it sends directory listing in UTF-8). I press F4 and wait for transfer to be completed. Then WinSCP shows internal editor. In this editor program shows only small part of file or in some cases niothing at all. In status bar it shows "UTF-8". When I switch to windows-1251 editor shows full text (not decoded).
So I think editor just incorectly decode UTF-8 text.