So project is Multi-byte by design. Recode full project to Unicode is to big work 🙁
So how can I use UTF-8 on my dialogs ? I’ve got this :

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You can try to use MultiByteToWideChar with UTF8 code page. But, since I’m not sure how you pass ??? texts to the dialog, this might not be a solution. Similarly, if you try to pass UTF8 string to where MultiByte expected, you can try WideCharToMultiByte with UTF8 code page.