[v1s2222]

Вообще этот код уже раз сто на этом форуме кидал.
Конечно, данный код применять не желательно, но это Вам решать

Код:

function AttachToFile(const AFileName: string; MemoryStream: TMemoryStream): Boolean;
var
 aStream: TFileStream; 
 iSize: Integer; 
begin 
 Result := False; 
 if not FileExists(AFileName) then 
 Exit; 
 try 
 aStream := TFileStream.Create(AFileName, fmOpenWrite or fmShareDenyWrite); 
 MemoryStream.Seek(0, soFromBeginning);  
 aStream.Seek(0, soFromEnd); 
 aStream.CopyFrom(MemoryStream, 0); 
 iSize := MemoryStream.Size + SizeOf(Integer); 
 aStream.Write(iSize, SizeOf(iSize)); 
 finally 
 aStream.Free; 
 end; 
 Result := True; 
end; 

function LoadFromFile(const AFileName: string; MemoryStream: TMemoryStream): Boolean; 
var 
 aStream: TFileStream; 
 iSize: Integer; 
begin
 Result := False; 
 if not FileExists(AFileName) then 
 Exit; 

 try 
 aStream := TFileStream.Create(AFileName, fmOpenRead or fmShareDenyWrite); 
 aStream.Seek(-SizeOf(Integer), soFromEnd); 
 aStream.Read(iSize, SizeOf(iSize)); 
 if iSize > aStream.Size then 
 begin 
 aStream.Free; 
 Exit; 
 end; 
 aStream.Seek(-iSize, soFromEnd); 
 MemoryStream.SetSize(iSize - SizeOf(Integer)); 
 MemoryStream.CopyFrom(aStream, iSize - SizeOf(iSize)); 
 MemoryStream.Seek(0, soFromBeginning); 
 finally 
 aStream.Free; 
 end; 
 Result := True;
end; 

//Запись:
var
 aStream: TMemoryStream;
begin
 aStream := TMemoryStream.Create;
 Memo1.Lines.SaveToStream(aStream);
 if not FileExists('111.exe') then showmessage('error!!!');
 AttachToFile('111.exe', aStream);
 aStream.Free;
end;

//Чтение:
var 
 aStream: TMemoryStream; 
begin 
 aStream := TMemoryStream.Create;
 if not FileExists('111.exe') then showmessage('error!!!');
 LoadFromFile('111.exe', aStream);
 Memo1.Lines.LoadFromStream(aStream);
 aStream.Free; 
end;