"written_mandarin_chinese"? One does not "write" Mandarin, it is a spoken dialect. The written language is "Chinese" and it is universal to all dialects of the spoken language (you want to be mutually intelligible, write things down, you may even get some Nihonjin that know what you're trying to say). Also, I see a little ル (katakana 'ru', Japanese)... what's a ル doing in a Chinese manuscript? I don't know much about Chinese except the above, but since I know some of those Kanji aren't Japanese, it must be a Chinese manuscript... or someone was very confused when writing it... or maybe it's a piece of writing about the Japanese language... I have no idea.
Anyway, on the topic of input, no, Chinese is entered left-to-right on a computer, Arabic is a more plausible explanation, but it's probably just a bug in X-Fire.
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