What is state of the art: Unicode file names on Windows

I confirm the answer from Todd. Now that VTK expects UTF8 encoded strings, you must force the active codepage to UTF8 by adding the following section in your app.manifest file:

  <application xmlns="urn:schemas-microsoft-com:asm.v3">
    <windowsSettings>
      <activeCodePage xmlns="http://schemas.microsoft.com/SMI/2019/WindowsSettings">UTF-8</activeCodePage>
    </windowsSettings>
  </application>

This has been fixed recently and won’t be required anymore in the next Activiz version that will be released before the end of the month.

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