[v1.8.13] XLRDError - C:\Python34\lib\site-packages\xlrd\book.py:1272

OpenNumismat: 1.8.13
OS: Windows 10 (10.0.19041)
Python: 3.4.4 (32bit)
Qt: 5.5.1
Locale: de

Traceback (most recent call last):
File "OpenNumismat\MainWindow.py", line 669, in importExcel
File "OpenNumismat\Collection\Import\__init__.py", line 127, in importData
File "OpenNumismat\Collection\Import\Excel.py", line 128, in _connect
File "C:\Python34\lib\site-packages\xlrd\__init__.py", line 157, in open_workbook
File "C:\Python34\lib\site-packages\xlrd\book.py", line 92, in open_workbook_xls
File "C:\Python34\lib\site-packages\xlrd\book.py", line 1278, in getbof
File "C:\Python34\lib\site-packages\xlrd\book.py", line 1272, in bof_error
xlrd.biffh.XLRDError: Unsupported format, or corrupt file: Expected BOF record; found b'\xef\xbb\xbf"M\xc3\xbcn'