mIRC 7.1 is fully unicode, unlike 6.35. This means that mIRC no longer uses codepages. Look around the various forums for explanations of exactly what this entails (like this very detailed
guide), but basically, you need to re-type your special characters based on their UNICODE CODEPOINT rather than the windows codepage value.
You can see a list of unicode codepoints (at least in the BMP)
here. You will want to use $chr(N) where N is the unicode codepoint (in decimal, not hex).
If this is about using 7.1 scripts in 6.35, you will not be able to unless you also re-convert the characters, which might be the problem you're having.
Perhaps you can be more specific about your issue?
