I think so. I haven't been able to open anything, no matter the format.
Code:
calibre, version 3.1.0
ERROR: Error: Error communicating with device
mtp:::%22oE04AC%22:::Storage device/Books/Hormone Diet, The - Natasha Turner ND.mobi is not a valid MTP path
Traceback (most recent call last):
File "site-packages\calibre\gui2\device.py", line 88, in run
File "site-packages\calibre\gui2\device.py", line 642, in _view_book
File "site-packages\calibre\devices\mtp\driver.py", line 328, in get_file
File "site-packages\calibre\devices\mtp\filesystem_cache.py", line 248, in resolve_mtp_id_path
ValueError: mtp:::%22oE04AC%22:::Storage device/Books/Hormone Diet, The - Natasha Turner ND.mobi is not a valid MTP path
and here's an azw3:
Code:
calibre, version 3.1.0
ERROR: Error: Error communicating with device
mtp:::%22oD97BB%22:::Storage device/Books/Cipher, The - Kathe Koja.azw3 is not a valid MTP path
Traceback (most recent call last):
File "site-packages\calibre\gui2\device.py", line 88, in run
File "site-packages\calibre\gui2\device.py", line 642, in _view_book
File "site-packages\calibre\devices\mtp\driver.py", line 328, in get_file
File "site-packages\calibre\devices\mtp\filesystem_cache.py", line 248, in resolve_mtp_id_path
ValueError: mtp:::%22oD97BB%22:::Storage device/Books/Cipher, The - Kathe Koja.azw3 is not a valid MTP path