How can I add new font for Plato?

A kind of localisation problem... I have FTN95 5.50 Personal Edition. Now I want to code a program with simple windowing interface (Clearwin+ suits well) for my students to treat their data. Writing window captions and text for controls became a real problem, as I want to write all this stuff in Russian. None of fonts available for Plato (Tools → Options → Fonts and Colours) support Russian ANSI letter encoding. So I have to use external editor (namely KoEdit) to write all Russian words that I want, and then open a modified code by Plato. It works, but it is not convenient. How can I add extra font for Plato (Times New Roman Cyr, for instance), that contains Russian letters?

Plato should show all available mono-spaced fonts in the Options dialog box. Do you have a mono-spaced Russian font on your machine?

Thanks! Yes, I am not sure that I have any mono-spaced font with ANSI Russian characters at all (not unicode) on my computer. If it is a real matter of all this mess, I'll search for such a font.