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en-US (Dictionary Language dir)
|--main.aff (Spellcheck dictionary description file)
|--main.dic (Spellcheck dictionary file)
main.aff & main.dic must place inside Language dir (like en-US)
1) (from web) Download The Spellcheck Zip Install Package, e.g.: en-US.zip
2) (from WPS) Review --> Set Spellcheck Language --> Install, and choose en-US.zip