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Why is this an issue?

  Implicitly using TEncoding.Default causes a platform-dependent default encoding to be
  used. The defaults are TEncoding.ANSI on Windows and TEncoding.UTF8 on
  all other platforms.


The methods that can implicitly use TEncoding.Default are:

  Vcl.Outline.TOutlineNode.WriteNode
  Vcl.Outline.TOutlineNode.LoadFromFile
  Vcl.Outline.TOutlineNode.LoadFromStream
  Vcl.Outline.TOutlineNode.SaveToFile
  Vcl.Outline.TOutlineNode.SaveToStream
  System.Classes.TStrings.LoadFromFile
  System.Classes.TStrings.LoadFromStream
  System.Classes.TStrings.SaveToFile
  System.Classes.TStrings.SaveToStream
  System.Classes.TStringStream.Create
  System.Classes.TStreamReader.Create
  System.Classes.TStreamWriter.Create


How to fix it
Explicitly specify the encoding:
MyStringList.LoadFromFile(FileName);

MyStringList.LoadFromFile(FileName, TEncoding.UTF8);


Resources

  
    
      Rad Studio API documentation: System.SysUtils.TEncoding.Default