Search notes:

mlang.dll

Multi Language Support
mlang.dll is intended to help developers solve problems presented by the international scope of the internet.
Although it provides COM interfaces, it does not come with a type lib (so add reference does not work in the Visual Basic Editor).
However, there is a mlang.ild in the Platform SDK under the include directory.

See also

The registry key HKEY_CLASSES_ROOT\MIME\Database\Rfc1766.

Links

https://docs.microsoft.com/en-us/previous-versions/windows/internet-explorer/ie-developer/platform-apis/aa767865(v=vs.85)
https://www.codeproject.com/Articles/17201/Detect-Encoding-for-In-and-Outgoing-Text

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