Foxit Reader leaves the following registry key after a run if dictionary/spell-check function is used.
HKCU\Software\Wintertree
Also it leaves a folder
%APPDATA%\Foxit Software\Foxit PhantomPDF\SpellCheck
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Foxit Reader leaves the following registry key after a run if dictionary/spell-check function is used.
HKCU\Software\Wintertree
Also it leaves a folder
%APPDATA%\Foxit Software\Foxit PhantomPDF\SpellCheck