Читаем CSV текстовый файл в StringGrid

procedure ReadTabFile(FN: TFileName; FieldSeparator:
Char; SG: TStringGrid);
var 
  i: Integer; 
  S: string; 
  T: string; 
  Colonne, ligne: Integer; 
  Les_Strings: TStringList; 
  CountCols: Integer; 
  CountLines: Integer; 
  TabPos: Integer; 
  StartPos: Integer; 
  InitialCol: Integer; 
begin 
  Les_Strings := TStringList.Create; 
  try 
    Les_Strings.LoadFromFile(FN); 
    CountLines := Les_Strings.Count + SG.FixedRows; 
    T := Les_Strings[0]; 
    for i := 0 to Length(T) - 1 do Inc(CountCols,
    Ord(IsDelimiter(FieldSeparator, T, i)));
    Inc(CountCols, 1 + SG.FixedCols); 
    if CountLines > SG.RowCount then SG.RowCount := CountLines; 
    if CountCols > SG.ColCount then SG.ColCount := CountCols; 
    InitialCol := SG.FixedCols - 1;
    Ligne := SG.FixedRows - 1; 
    for i := 0 to Les_Strings.Count - 1 do 
    begin 
      Colonne := InitialCol; 
      Inc(Ligne); 
      StartPos := 1; 
      S := Les_Strings[i]; 
      TabPos := Pos(FieldSeparator, S); 
      repeat 
        Inc(Colonne); 
        SG.Cells[Colonne, Ligne] := Copy(S, StartPos, TabPos - 1); 
        S := Copy(S, TabPos + 1, 999); 
        TabPos := Pos(FieldSeparator, S); 
      until TabPos = 0; 
    end; 
  finally 
    Les_Strings.Free; 
  end; 
end; 
 
procedure TForm1.Button1Click(Sender: TObject); 
begin 
  Screen.Cursor := crHourGlass; 
  ReadTabFile('C:\TEST.TXT', #9, StringGrid1); 
  Screen.Cursor := crDefault; 
end;

Взято с https://delphiworld.narod.ru