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At Minecraft client software language setting, select "日本語"(Japanese).\\
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Install any of the following mods.\\
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◆MinecraftIM\\
[[http://forum.minecraftuser.jp/viewtopic.php?f=13&t=153|Topic No.153]]\\
Find the subhead named ”MinecraftIM” and click the following button which title is "表示/非表示".\\
Then select appropriate version file and download it. Then install it.(Modloader is not required.) \\
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◆NihongoMOD\\
[[http://forum.minecraftuser.jp/viewtopic.php?t=6279|Topic No.6279]]\\
At the above web page, download appropriate file and install it.(Modloader is required.)\\
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1. Install Minecraft client software cleanly.\\
2. Download MOD LOADER module from the specific website(*1) and decompress it to any temporal folder.\\
3. Open the file named Minecraft.jar ordinarily located in "C:\Users\[Windows user name]\AppData\Roaming\.minecraft\bin")\\
4. Copy all the files (decompressed at above 2) into the root folder in the opened Minecraft.jar. And remove the folder named "META-INF" with files.\\
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(*1)\\