AFAIK Fixedsys is installed with all versions of Windows by default. In fact you must have it otherwise you wouldn't be viewing the text as Fixedsys in mIRC.
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It's probably because it's a bitmap font rather than a truetype font. There's a truetype version of Fixedsys available here (I've never used it though, so user beware).
Spelling mistakes, grammatical errors, and stupid comments are intentional.