function MemoryStreamToString( M : TMemoryStream) : string;
begin
  SetString( Result,PChar(M.Memory),M.Size div SizeOf(Char)); // Works in all Delphi versions
end;
 
var
  memStream : TMemoryStream;
  textList  : TStringList;
begin
  textList := TStringList.Create; 
  try
    memStream:= TMemoryStream.Create;
    try
      memStream.LoadFromFile('mytextfile.txt');
      textList.Text := MemoryStreamToString( memStream);  // any combination of CR,LF,CRLF interprets as a line
    finally
      memStream.Free;
    end;
    // do something with textList
 
  finally
    textList.Free;
  end;
 
end;