CFileDialog properties

Hi,
I hope you can help me on this.
I have a class in which one function opens a CFileDialog to save a file.
Is it possible to access the textbox of the dialog where the user type the filename?
I just want to avoid the user typing a filename in extended ascii character. For now, user can type in the filename textbox of the file dialog the extended ascii character by pressing Alt + 128 thru Alt + 225.

I attempted to trap this by getting its decimal value but I noticed that some character like Alt + 224 will automatically converted to normal character which is an 'a'.

Is there a better way to do this?

regards
gilmar
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