KeyboardSetting=German, commandline =  .\vncviewer-1856-solution-attempt-9.exe -Log *:file:100
$ aBcÄÖäöß\aBcÄÖäöß\ßa
aBcÄÖäößaBcÄÖäößßa: Command not found.
$ \\\\\\\\\\öööööäääääßßßßß
\\\\\öööööäääääßßßßß: Command not found.
$ 
I think I see what you're saying now, I see the backslash being typed in the terminal but the system says it is NOT being typed.



KeyboardSetting=Auto, commandline =  .\vncviewer-1856-solution-attempt-9.exe -Log *:file:100
$ aBcÄÖäöß\aBcÄÖäöß\ßa
aBcÄÖäößaBcÄÖäößßa: Command not found.
$ \\\\\\\\\\
\\\\\: Command not found.
$ öööööäääääßßßßß
öööööäääääßßßßß: Command not found.
$ 

This portion:$ \\\\\\\\\\
\\\\\: Command not found.
may suggest the Terminal displays each entry but the system sees only every 2nd backslash??