How do I convert from Unicode to ANSI?

I’m in a bind. While most people who make fonts are working with Unicode, my problem is to get my font out of unicode encoding and into a strict ANSI encoding. I’ve made a True Type Vietnamese font, using Windows XP Pro, and when I view it with Font Expert “properties” in Windows, it displays “IsUnicode: Yes”. The Vietnamese ANSI font that I’ve used as a reference for making my own Vietnamese glyphs displays “IsUnicode: No”. The word parsing program that will use this font does not support unicode so the font must be strict ANSI.
How do I convert this with Font Creator? Thank you.

I only have Windows ME, so cannot test this, but my best guess is that what you have to do is go to Format, Settings, Ranges, and in the drop down for “Contents and layout” select Version 0. Then below that click on the calculate button which will remove all of the supported Unicode Ranges. Hopefully, your program will then no longer think that it is a Unicode font.

Thank you very much for this information. I deeply appreciate it.