German Umlauts in BookOutputName

[sir.teddy.the.first]

Hi all,

 

\version "2.19.83"


\header { title = "Wächter"}

\book 
{  
  \bookOutputName "Wächter"
  \score {
    {c d e f}  
  }
}

 

Whenever I run this code, the title itself is correctly displayed with the
Umlaut, but the .pdf-File is always named “Wächter.pdf”. I’m on Windows 10.

The standard solution would be to change the encoding to UTF-8, but that is
already the case, at least for the files where I can change it.

But I have the suspicion that Lilypond is still operating in ANSI, because
the generated .log-file will always be encoded in ANSI.

This is probably a Windows-only problem, but what could I do to solve it?

(Of course I could just get rid of the Umlauts or rename the file in the
explorer, but it would be nice to understand what is causing this)

 

Thanks in advance