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//Bestimmt die Buildnummer einer Anwendung
//Parameter:
//  Filename: Der vollständige Dateiname inkl. Pfad der Anwendung, von der die Buildnummer bestimmt werden soll.
function GetBuildNumber(Filename: string): string;
type
  thilo=record
    case integer of
      0: (all:dword);
      1: (lo:word;hi:word);
    end;

var buffer:pointer;
    dummy:cardinal;
    size:cardinal;
    p:pointer;
    data:^vs_FIXEDFILEINFO;
    hilo:thilo;
    lastpointindex:integer;
begin
  result:='';
  size:=GetFileVersionInfoSize(pchar(filename),dummy);
  GetMem(buffer,size);
  try
    if not GetFileVersionInfo(pchar(application.exename),0,size,buffer) then
    begin
      result := '';
      exit;
    end;
    p:=nil;
    if not VerQueryValue(buffer,pchar(''),p,size) then
    begin
     result := '';
     exit;
    end;
    data:=p;
    hilo.all:=data^.dwFileVersionms;
    result:=IntToStr(hilo.hi);
    result:=result+'.'+IntToStr(hilo.lo);
    hilo.all:=data^.dwFileVersionls;
    result:=result+'.'+IntToStr(hilo.hi);
    result:=result+'.'+IntToStr(hilo.lo);
  finally
    FreeMem(buffer);
  end;

  result :=  ReverseString(result);
  lastpointindex := Length(result) - Pos('.',result) + 1;
  result :=  ReverseString(result);
  result := Copy(result,lastpointindex + 1,Length(result) - lastpointindex);
end;                    

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//Aufruf e.g.:
procedure TForm1.Button3Click(Sender: TObject);
begin
  showmessage(GetBuildNumber(Application.ExeName));
end;

//Anzeigen in Titelleiste:
procedure TForm1.FormCreate(Sender: TObject);
begin
  Caption := Caption + ' - Build ' + GetBuildNumber(Application.ExeName);
end;