[v1.6.7] UnicodeDecodeError - c:\Python34\lib\site-packages\xlrd\timemachine.py:30

OpenNumismat: 1.6.7
OS: Windows 10 (10.0.16299)
Python: 3.4.4 (32bit)
Qt: 5.5.1
Locale: es

Traceback (most recent call last):
File "d:\OpenNumismat\open-numismat\OpenNumismat\MainWindow.py", line 548, in importExcel
File "d:\OpenNumismat\open-numismat\OpenNumismat\Collection\Import\__init__.py", line 127, in importData
File "d:\OpenNumismat\open-numismat\OpenNumismat\Collection\Import\Excel.py", line 116, in _connect
File "c:\Python34\lib\site-packages\xlrd\__init__.py", line 162, in open_workbook
File "c:\Python34\lib\site-packages\xlrd\book.py", line 119, in open_workbook_xls
File "c:\Python34\lib\site-packages\xlrd\book.py", line 719, in get_sheets
File "c:\Python34\lib\site-packages\xlrd\book.py", line 710, in get_sheet
File "c:\Python34\lib\site-packages\xlrd\sheet.py", line 815, in read
File "c:\Python34\lib\site-packages\xlrd\biffh.py", line 249, in unpack_string
File "c:\Python34\lib\site-packages\xlrd\timemachine.py", line 30, in
UnicodeDecodeError: 'ascii' codec can't decode byte 0xed in position 2: ordinal not in range(128)