File dialog failed (return code 3489660927) 5.39 and 5.39.1

[manixdk]

calibre 5.39.1 [64bit] embedded-python: True is64bit: True
Windows-10-10.0.22000 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.22000')
Python 3.8.5
Windows: ('10', '10.0.22000', '', 'Multiprocessor Free')
Interface language: None
Successfully initialized third party plugins: Gather KFX-ZIP (from KFX Input) (1, 47, 0) && Package KFX (from KFX Input) (1, 47, 0) && Job Spy (1, 0, 190) && KFX metadata reader (from KFX Input) (1, 47, 0) && KFX Input (1, 47, 0) && Obok DeDRM (6, 3, 6) && Quality Check (1, 12, 0)
Traceback (most recent call last):
File "calibre\gui2\actions\add.py", line 532, in add_books
File "calibre\gui2\__init__.py", line 730, in choose_files_and_remember_all_files
File "calibre\gui2\win_file_dialogs.py", line 269, in choose_files
File "calibre\gui2\win_file_dialogs.py", line 210, in run_file_dialog
Exception: File dialog failed (return code 3489660927):

And I can't change the default file view unless I type *.* as file name. It was working fine in 5.38

[DNSB]

Odd. When I open the basic add books dialog, the file type selector box lets me select from Books (most book file types) to all files (*.*).

Can you give a better description of how you are attempting to add books? Just clicking on the Add Books icon? One of the options from the dropdown menu? Add from folder and subfolders?

Which antivirus are you running? I've seen a similar error when AV was blocking calibre's normal operations. See https://bugs.launchpad.net/calibre/+bug/1899778

Edit: If your AV allows, you could try excluding the calibre2 directory and it's subdirectories.

[georgemk]

Discussed here at https://www.mobileread.com/forums/sh...d.php?t=335205

[manixdk]

Originally Posted by DNSB

Odd. When I open the basic add books dialog, the file type selector box lets me select from Books (most book file types) to all files (*.*).

Can you give a better description of how you are attempting to add books? Just clicking on the Add Books icon? One of the options from the dropdown menu? Add from folder and subfolders?

Which antivirus are you running? I've seen a similar error when AV was blocking calibre's normal operations. See https://bugs.launchpad.net/calibre/+bug/1899778

Edit: If your AV allows, you could try excluding the calibre2 directory and it's subdirectories.

Just clicking on the add. Normally, all files are shown, but now, in the square at the bottom to the right of the of the file dialog above "open" and "cancel", when I click to change the selection, the above exception happens. 5.38 worked fine.
I use McAfee.

[kovidgoyal]

Something on your computer, most likely the anti-virus, is blocking the calibre
helper process for file dialogs (calibre-file-dialog.exe). Disable the
antivirus or add an exception for calibre-file-dialog.exe and you should be
fine. Alternatively, you can tell calibre to not use native file dialogs, which
avoids the helper process, by setting the CALIBRE_NO_NATIVE_FILEDIALOGS
environment variable to 1 as described here:
https://manual.calibre-ebook.com/cus...ment-variables