I want to create HTML help for an existing project. Previously the source code was in a sub-directory of D:\schoening (which worked), now it is in a sub-directory of D:\Schöning. The latter doesn't work: I get the attached exception for every file to process when I click "Run" in doxywizard.
I tried doxygen 1.16.1 and 1.9.8. Is there a way to solve this problem so that doxygen gets along with "ö" in file paths?

The exception (translated from German):

Unhandled Excpetion: System.IO.DirectoryNotFoundException: Part of the path "D:\Sch��ning\[…].cs" could not be found.
   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy)
   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options, String msgPath, Boolean bFromProxy)
   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access)
   at FilterProgram.Program.Main(String[] args)