I don't remember the details of that feature. I added it when working with modder01 for his Immersion mod and he was having some character trouble in his displays because he wanted some extra characters that didn't work because of the encoding he was saving some .txt/dialog files. I added the UTF8toANSI feature so it would convert them to extended ASCII that the original game would understand and perhaps he made some subsequent changes that required switching that new feature off, if he changed the encoding of his files. Whatever setting works, I would just go with that. Normally, by default, every other mod assumes it is off/zero, unless it is explicitly set to equal 1 in the fonts.ini file.