Ruby And Russion symbols

Today I have met interesting problem while I have tried to use Russian symbols in Ruby's strings on Windows XP.

So listing of main.rb

hello_world = "привет мир"

Ruby main.rb says:

invalid multibyte char (US-ASCII)

As I know Default Far Manager encoding is cp1251.

But all googling links tell only about next magic comment:

# coding: utf-8

I have tried this but got next:

invalid multibyte char (UTF-8)

So if you are using Far. Magic comment is:

# coding: cp1251