procedure TForm1.Button1Click(Sender: TObject);
var
s: string;
begin
with TStringList.Create do
try
LoadFromFile('Your Text File Name');
s := Text;
while pos(#13, s) > 0 do
System.Delete(s, pos(#13, s), 1);
while pos(#10, s) > 0 do
System.Delete(s, pos(#13, s), 1);
Text := s;
SaveToFile('Your Text File Name');
finally
Free;
end;
end;