ok this should solve your problem http://www.hfautism.com/filterproxy.exe
run it with the irc server you wan' to use as a command line perameter for example
filterproxy eu.undernet.org
then tell mschat to connect to localhost and it should work
note : i don't actually have a copy of mschat so i haven't tested this with it but it damn well should work :)
p.s. if you wan't to put this on a website please mirror it rather than linking it
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