This is a conversion of "UniDic" (approximately 1.02 million words) - a
corpus dictionary from the National Institute for Japanese Language and
Linguistics - into the Mozc user dictionary format. It includes
approximately 267,000 words. No build process is required; you can use
it simply by importing it via the GUI dictionary tool.

Important:
This adds approximately 138,000 words that Mozc otherwise cannot
convert. The trade-off is a slight degradation in the conversion of
everyday vocabulary.