The Delocalizer file tells the game what characters it can and can't localize to the player's language. It is important that this is included with plugins and in SimCityLocale.dat due to those files containing LTEXTs which are unicode and are applied to this. The TGI for the Delocalizer is 2026960b 6a231eaa 0a6df4df, which places it as an LTEXT file itself, however it cannot be read as a plain text file like an LTEXT can.
The format of the Delocalizer is:
DWORD - Size of file minus this Dword 16 Bytes - "Don't localize. " In plain Text BYTE - x - Marks the beginning of the string Unicode for non-localizable text characters BYTE - x - Marks the end of the string