: This suffix generally indicates a Japanese region version of the game. While many Nintendo Switch games are region-free and include multiple languages, region-specific files are often labeled this way to denote their origin. Game Overview
So why would an English-speaking user want a Japanese ( -J ) copy of Breath of the Wild ? The Legend of Zelda Breath of the Wild -NSP- -J...
If you are legally running a dumped copy (e.g., via a modded Switch, Yuzu, or Ryujinx emulator), note the following: : This suffix generally indicates a Japanese region