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Use StringGrid2File procedure to save TStringGrid to file.
Use File2StringGrig to restore TStringGrid from file.

procedure TForm1.File2StringGrid(StringGrid: TStringGrid; 
                                 FileName: String);
var
  F: TextFile;
  Tmp, x, y: Integer;
  TmpStr: string;
begin
  AssignFile(F, FileName);
  Reset(F);
  Readln(F, Tmp);
  StringGrid.ColCount:=Tmp;
  Readln(F, Tmp);
  StringGrid.RowCount:=Tmp;
  for x:=0 to StringGrid.ColCount-1 do
    for y:=0 to StringGrid.RowCount-1 do
    begin
      Readln(F, TmpStr);
      StringGrid.Cells[x,y]:=TmpStr;
    end;
  CloseFile(F);
end;

procedure TForm1.StringGrid2File(StringGrid: TStringGrid; 
                                 FileName: String);
var
  F: TextFile;
  x, y: Integer;
begin
  AssignFile(F, FileName);
  Rewrite(F);
  Writeln(F, StringGrid.ColCount);
  Writeln(F, StringGrid.RowCount);
  for x:=0 to StringGrid.ColCount-1 do
    for y:=0 to StringGrid.RowCount-1 do
      Writeln(F, StringGrid.Cells[x,y]);
  CloseFile(F);
end;

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