Force Resharper spell-checker not to accept a word

I understand that Resharper's spell checker has a user dictionary which can be set in foo.sln.DotSettings and foo.sln.DotSettings.user. This allows you to add additional words so they won't be flagged as spelling errors.

I would like to do the opposite: remove a word from the dictionary. I want the word filename to be flagged as a spelling mistake, even though it is in the English dictionary, because the project standards mandate fileName.

I've tried adding it to the settings file as an explicit False

<s:Boolean x:Key="/Default/UserDictionary/Words/=filename/@EntryIndexedValue">False</s:Boolean>

but that doesn't do the trick. (When you add a word to the user dictionary it appears here but with True.)

Is it possible to make the spellchecker flag this word, without going so far as building a whole new English spelling dictionary?