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I have the same problem, started happening today. WIN 10 PC.
Here's my error message:
calibre, version 5.7.2
ERROR: Unhandled exception: <b>Exception</b>:File dialog failed (return code 3489660927):
calibre 5.7.2 [64bit] embedded-python: True is64bit: True
Windows-10-10.0.19041 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.19041')
Python 3.8.5
Windows: ('10', '10.0.19041', '', 'Multiprocessor Free')
Interface language: None
Successfully initialized third party plugins: Gather KFX-ZIP (from KFX Input) (1, 36, 0) && Package KFX (from KFX Input) (1, 36, 0) && EpubCheck (0, 2, 3) && EpubSplit (3, 0, 0) && Find Duplicates (1, 8, 3) && KFX metadata reader (from KFX Input) (1, 36, 0) && KFX Input (1, 36, 0) && MultiColumnSearch (1, 0, 86) && Quality Check (1, 11, 0) && User Category (1, 5, 5) && View Manager (1, 6, 0)
Traceback (most recent call last):
File "calibre\gui2\actions\add.py", line 494, in add_books
File "calibre\gui2\win_file_dialogs.py", line 270, in choose_files
File "calibre\gui2\win_file_dialogs.py", line 211, in run_file_dialog
Exception: File dialog failed (return code 3489660927):
Thanks for helping. FYI, I have 2 exceptions in my AV software. 1. calibre-parallel.exe and 2 my calibre library.
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