Spelling is a short section.
MicroStation's core dictionaries are located by MS_SPELLINGDICTIONARYPATH, in C:\ProgramData\Bentley\MicroStation V8i (SELECTseries)\WorkSpace\system\data\, this should not be changed.
MS_SPELLINGUSERDICTIONARY can be used to specify a location and name for the user's individual spelling dictionary, e.g.: MS_SPELLINGUSERDICTIONARY = $(_USTN_USER)$(USERNAME)_msspell.dic
The spelling dictionary...