Behdad Esfahbod added the comment:

Thanks Marc-Andre.  If the x_ was indeed added for that reason, it's quite a 
coincidence, because the MIME name of these encodings also starts with 
x-mac-..., so I assumed that's where the x_ comes from.

The mappings are available at the Unicode website:
http://unicode.org/Public/MAPPINGS/VENDORS/APPLE/JAPANESE.TXT
http://unicode.org/Public/MAPPINGS/VENDORS/APPLE/CHINTRAD.TXT
http://unicode.org/Public/MAPPINGS/VENDORS/APPLE/KOREAN.TXT
http://unicode.org/Public/MAPPINGS/VENDORS/APPLE/CHINSIMP.TXT

As for actual use, they are part of the OpenType standard.  So by user request, 
I had to implement them last week in the FontTools Python library.  This is 
useful for people when dealing with old and legacy fonts, specially in the 
process of converting them to Unicode-compatible fonts.

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