Calibre 尝试使用 epub 查看器打开 PDF(但不打开 DJVU)

Calibre 尝试使用 epub 查看器打开 PDF(但不打开 DJVU)

这会导致这个错误:

Traceback (most recent call last):
  File "/usr/lib/calibre/calibre/utils/ipc/simple_worker.py", line 284, in main
    res = {'result':func(*args, **kwargs)}
  File "/usr/lib/calibre/calibre/ebooks/oeb/iterator/book.py", line 55, in extract_book
    plumber = Plumber(pathtoebook, tdir, log, view_kepub=view_kepub)
  File "/usr/lib/calibre/calibre/ebooks/conversion/plumber.py", line 720, in __init__
    raise ValueError('Input file must have an extension')
ValueError: Input file must have an extension

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