This is the main dictionary. It is stored in a compressed format, and is read-only.

You can edit the spell dictionaries or create your own using the C1DictionaryEditor utility that ships with C1SpellChecker. This option can be useful for domain-specific applications that require the use of technical jargon (for example, medical, legal, and so on).

Users cannot add words to this dictionary, only to the UserDictionary.