Cyrillic text

Dear all,

for an external software - undocumented as it is, of course, I need to
provide
some text in Russian in a .txt file. Unfortunately, as I use a German
Windows/
Linux computer, I haven’t found a way of telling my system that I want
it
to encode text as Cyrillic - choosing a Windows 1251 encoding and
saving in Word as Encoded text always saves the document as Unicode,
which
the external software does not understand.
Can you help me ?
Thank you very much!

Best regards,

Axel E.