Although the application is Unicode, it seems that the RichText controls hosted by dialogs cannot accept Unicode strings from the API.
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Archive for the ‘Windows’ Category
Customized GetNumberFormat and GetCurrencyFormat
The GetNumberFormat and GetCurrencyFormat Windows API accepts a pointer to a structure or NULL. But there is no API to fill the structures with the values matching a certain locale.
Setting the user and system locales
One of the most basic operations. You will need to do this countless times if you have to use non-Unicode applications to manipulate localized data (for instance if you have to resize Japanese resources in Developer Studio .NET 2003 or earlier).
How SBCS-MBCS-Unicode application interact with Windows
Explains why the ANSI-Unicode applications separation, and why the limitations of ANSI applications cannot be solved without moving to Unicode.