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I am currently using a Japanese Apple keyboard (Model A1048) on Windows 8.1. I have two issues with this setup. The first issue is that they keyboard is detected as a US layout keyboard, which causes issues with many of the symbol keys. The previous issue can be partly remedied by editing the registry, as detailed here. But that still leaves me with another problem (the focus of this post): the conversion and kana keys don’t work.
Activating the layout hasn't been an issue; it's getting all the extra keys to be recognised. I would imaging that with most Japanese keyboards this wouldn't be an issue, but it seems that the Apple version has some of the keys mapped differently than is standard. – grandta13 – 2015-02-08T05:02:28.173
use a third party software to add the extra keys on your keyboard, just google it, this should be solved days ago – Alberto – 2015-02-09T08:36:10.417