MultiByteToWideChar WINE vs Win32 not returning same result!?

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C++

C

Win32

UTF-8

I am converting utf8 to utf16/unicode and I want to get the same result under windows and linux.

Note: "0xBF" is not valid utf8 character.

c:

char str[] = { 0xBF, 0 };
MultiByteToWideChar(CP_UTF8, 0, str, nLen8, pszUtf16, nLen16);

c#

byte[] abCH = new byte[] { 0xBF };
string str = System.Text.Encoding.UTF8.GetString(abCH);
byte[] abCHUni = Encoding.Unicode.GetBytes(str);

Under windows, c and c# code will return:
"0xBF" is converted to "0xFD 0xFF".

Under linux (same executable run by WINE):
"0xBF" is not converted.

Under windows (call to MultiByteToWideChar from WINE source code):
"0xBF" is not converted.

Microsoft and WINE function "MultiByteToWideChar" does not return the same result for invalid utf8 characters.

Does anyone have source code for "MultiByteToWideChar"(from Microsoft) or code that will produce the same result under windows / linux for invalid utf8 characters?

Regards,
Tomice