It is related to IE10, which I recently installed on my Windows 7 x64 system.
Screenshots from ProcExp:
From IE10 - select blue TOOLS button; "Internet Options" -
For additional info on IE10 & Spellchecking in IE10 -
▪ Spellchecking in IE10
▪ Spelling checker dictionary add-ons for Internet Explorer 10 Release Preview in Windows 7 SP1 are available
IE10 is standard on Windows 8; available for Windows 7 -
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