What you're showing there for mirc 6 is either a typo or is for an earlier v6 that didn't have any UTF8 settings. The settings there have changed in mirc7, so if you want to know what the mirc.ini settings are for the font you want, you'd need to use the /view/font dialog to set it the way you want, while that window or window-type is active. The same menu is also seen in the dropdown from the upper left corner of the window itself, for channel, query, etc. Once you have the window looking the way you want, then you can look to see what the mirc.ini looks like.
I'm seeing the display a little different than yours, such as seeing 421's instead of 410's, but that may be related to regional language or operating system.
Some of the numbers are related to features no longer used, and may be there as place-holders in case the .ini is used into an older version. For example, the 2nd number '0' you're seeing is related to the "script" in the font window dropdown, which supports other alphabets like hebrew or cyrillic. the '2' you're seeing is the field related to the former 'utf8' dropdown in the font window, where the '2' setting was for 'display and encode', which is in effect the default setting for mirc7. Well, not for the scripts editor setting, where there's no incoming text to handle. The 3 digit number changes when you set the font to bold, and when setting to italics, that 2nd zero becomes 255.
If your script is editing that value in mirc.ini, it either needs to change to using the /font command, or needs to be updated to handle the new format.
