Using os.startfile to open Excel but Slicer killed itself

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Operating system: Windows 11
Slicer version: 5.8.1
Expected behavior: open a csv-file via Excel
Actual behavior: After Excel opens the file, Slicer-3D kills itself (crash?).

if self.flt_OpenExcelNow_CheckBox.isChecked():
    try:
      tmp= os.startfile( "the_file_nam.csv" )
      print(tmp)
      return
    except:
      print('Done or something wrong? ')
      return