What is codepage of Russian comments in the (Lua) source file?

[aaaaa]

When i modify some text files of this game like Lua file, I found that lots of Russian comment there. What is codepage / encoding of these Russian text? I am completely ignorant of Russian language and codeset.
It must be one of Cyrillic DOS-855, DOS-866, iso8859-5, KOI8-R, KOI8-U, Mac Cyrillic (cp10007), Window (cp1251).
Language file (*.lng) seems to use Unicode encoding, so it doesn't matter.

If I set codepage incorrectly, I may corrupt the Russian text part inadvertently while editing the file.

[bman654]

windows-1251. I used this page to convert them to Cyrillic so I could translate them.

[aaaaa]

Thanks. In that encoding, the Russian text in those files seems to be displayed correctly even in the complete foreigner's eys.