function GetThreadID(const FileName: String): TDWordList;
var
  ToolHnd, MToolHnd: THandle;
  PE32: TProcessEntry32;
  ME32: TModuleEntry32;
  TE32: TThreadEntry32;
  PIDArray, ThreadArray: TDWordList;
  a: Integer;
  PID: DWord;
begin
  PIDArray := nil;
  ThreadArray := nil;
  ToolHnd := CreateToolHelp32Snapshot(TH32CS_SNAPPROCESS or TH32CS_SNAPTHREAD, 0); //Handle auf Snapshot
  if ToolHnd = INVALID_HANDLE_VALUE then RaiseLastWin32Error;
  try
    PE32.dwSize := SizeOf(ProcessEntry32);
    if not Process32First(ToolHnd, PE32) then RaiseLastWin32Error; //erster Prozess
    repeat
      if CompareText(PE32.szExeFile, ExtractFileName(FileName)) = 0 then
      begin
        SetLength(PIDArray, Length(PIDArray) + 1);
        PIDArray[Length(PIDARRAY) - 1] := PE32.th32ProcessID;
      end;
    until not Process32Next(ToolHnd, PE32);

    { Jetzt sind alle PIDs der Prozesse, deren Dateinamen gleich dem gesuchten ist, gespeichert }
    { Jetzt wird für jeden Prozess anhand der Modulliste der vollständige Pfad ermittelt und so }
    { die endgültige, richtige ProcessID ermittelt.                                             }

    PID := 0;
    for a := 0 to Length(PIDArray) -1 do
    begin
      MToolHnd := CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, PIDArray[a]); //Modulliste des gewählten Prozesses
      if MToolHnd = INVALID_HANDLE_VALUE then RaiseLastWin32Error;
      try
        ME32.dwSize := SizeOf(TModuleEntry32);
        if not Module32First(MToolhnd, ME32) then RaiseLastWin32Error;
        repeat
          if CompareText(ME32.szExePath, FileName) = 0 then
          begin
            PID := ME32.th32ProcessID;
            Break;
          end;
        until not Module32Next(MToolHnd, ME32);
      finally
        CloseHandle(MToolHnd);
      end;
      if PID <> 0 then Break;
    end;

    { Jetzt werden alle Threads des Prozesses ermittelt                                         }

    TE32.dwSize := SizeOf(ThreadEntry32);
    if not Thread32First(ToolHnd, TE32) then RaiseLastWin32Error;
    repeat
      if TE32.th32OwnerProcessID = PID then
      begin
        SetLength(ThreadArray, Length(ThreadArray) + 1);
        ThreadArray[Length(ThreadArray) - 1] := TE32.th32ThreadID;
      end;
    until not Thread32Next(ToolHnd, TE32);
  finally
    CloseHandle(ToolHnd);
  end;
  if Length(ThreadArray) > 0 then
  begin
    Result := ThreadArray;
  end else Result := nil;
end;

type
  TDWordList = Array of DWord;