Common Dialog Box in WinCE (evc++ API)

Hi People,

I'm trying to load a common dialog box on a Pocket PC, but my Common Dailog fails to load. when i call the GetLastError function it display 120 what does this mean???

I have list my code below so that you can get a better understand

      int rnet;
      OPENFILENAME ofn;
      TCHAR szFile[MAX_PATH+1] = {0};
      memset(&ofn, 0, sizeof(ofn));
      // Fill out data structure
      ofn.hInstance         = GetModuleHandle(NULL);
      ofn.lpstrCustomFilter = 0;
      ofn.lpstrInitialDir   = 0;
      ofn.lStructSize = sizeof(ofn);
      ofn.lpstrFilter = TEXT("Image Files (*.Log)\0*.log\0All Files (*.*)\0*.*\0");
      ofn.lpstrFile = szFile;
      ofn.nMaxFile = MAX_PATH;
      ofn.lpstrTitle = TEXT("Open Squeak image ...");
      ofn.Flags = OFN_EXPLORER | OFN_FILEMUSTEXIST | OFN_HIDEREADONLY;
      ofn.lpstrDefExt = TEXT("image");
      ofn.hwndOwner = hDlg;

      // Show dialog
      if (!GetSaveFileName(&ofn))
      {
                   rnet = GetLastError();
            Printf(L"Failed to Display Dialog BOX");
            Printf(L"GetLastError = %d",rnet);
            return FILE_ERROR;
      }

      return FILE_OK;



I developing in eVC++ 3.0 using API calls not MFC.