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How to set up LyX for Japanese

I. Windows

1. Setup TeX environment and tune up LyX

There is a Japanese installer in this Japanese page, which automates the process after "Install Japanese layout files" in this section (you still need to go through "2. Modify LyX settings").

Install LyX for Windows using the official installer or this this alternative installer
Install pTeX (Japanese-specific LaTeX-programs) from this page:
1. Download all packages from there to a folder on your computer that doesn't have spaces in its path, e.g. to "C:\pTeX".
2. Extract the package file texinst756.zip to the folder C:\pTeX
3. Open a console, change to the folder C:\pTeX and execute the command
  texinst756 C:\pTeX
Download dviout (DVI viewer that can handle Japanese characters) from CTAN and install
1. After finishing installation, start dviout and open menu Option -> Setup Parameters...
2. In the Font tab, set TEXROOT, TEXPK and TEXFONTS variables appropriately. Pushing "Guess" button may help.
3. In the Font2 tab, set gen: appropriately. Pushing "gen:" button does automatic search for you.
4. In the WinJFont tab, choose appropriate Japanese font for "Windows Font". Normally "MS Mincho" (font name may be shown in Japanese name) is used.
Install the LaTeX-package "japanese":
1. Download it from here
2. Extract the zip file to C:\pTeX\share\texmf\tex\latex\japanese
3. Open a console, change to the directory C:\pTeX\share\texmf\tex\latex\japanese and execute the command
  platex japanese.ins
4. Change in the console to the folder C:\pTeX\bin and execute the command
  texhash
Install Japanese layout files:
Download following Japanese layout files to C:\Program Files\LyX15\Resources\layouts
Open C:\Program Files\LyX15\Resources\languages file with an editor and find a line beginning with "japanese" and edit as follows:

japanese "" "Japanese" false shift-jis-plain ja_JP ""

Note: The return code of the file is not for Windows, so lines may look mixed depending on the editor you choose (e.g. notepad).

Open C:\Program Files\LyX15\Resources\encodings file with an editor and add the following lines

# Japanese TeX programs require neither CJK nor inputenc package
Encoding euc-jp-plain EUC-JP-pLaTeX EUC-JP variable none
End
Encoding jis-plain JIS-pLaTeX ISO-2022-JP variable none
End
Encoding shift-jis-plain SJIS-pLaTeX CP932 variable none
End

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2. Modify LyX settings

After starting LyX, modify the settings as follows.

Open the menu Tool -> Preferences -> Converters
1. Remove the converter definition "LaTeX (plain) -> DraftDVI"
2. Add a converter definition "LaTeX (plain) -> DVI" with the converter platex $$i
3. Push "Apply" button
Open the menu Tool -> Preferences -> File formats
1. Choose "DVI" from the "File formats" pane
2. Modify "Viewer:" to the path of dviout, say C:\usr\dviout\dviout if it is in the folder C:\usr\dviout\
3. Push "Apply" button
Open the menu Tool -> Preferences -> Language setting -> Language
1. Change the "Default language:" to "Japanese"
2. Push "Save" button

(Edit Section ↓)

(Notes)

You need for all steps of the Windows installation administrator privileges.
There is currently no Japanese spellchecker dictionary available.

(Edit Section ↓)

II. Mac

Install LyX for Mac as explained on this Wiki page.
Install the pTeX-package for MacOS as explained here.
Follow the steps 3. and 4. from the Windows installation routine (Use the platex path of your system and not C:\pTeX\bin)

(Edit Section ↓)

III. Categories

Japanese / Windows / Mac