Keep your eye on the code page: Is this string CP_ACP or UTF-8?

Raymond Chen June 11, 2015 Jun 11, 2015 06/11/15

A customer had a problem with strings and code pages. The customer has a password like "Müllwagen" for a particular user. Note the umlaut over the u. That character is encoded as the two bytes C3 BC according to UTF-8. When the customer passes this password to the Logon­User function in order to authenticate the user, the call fails...