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