[M.A.D.M.A.N.]

Код:

var SaveStream:TMemoryStream;
Text:String;
begin
savestream:=tmemorystream.create;
text:=edit1.text;
savestream.write(text,length(text));
text:=edit2.text;
savestream.write(text,length(text));
savestream.savetofile('FileName.txt');
savestream.free;
end;

Вот и все.